{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-83557", "assignerOrgId": "36c7be3b-2937-45df-85ea-ca7133ea542c", "state": "PUBLISHED", "assignerShortName": "HeroDevs", "dateReserved": "2026-08-31T18:32:14.405Z", "datePublished": "2026-09-01T14:57:01.340Z", "dateUpdated": "2026-09-01T17:46:40.145Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "36c7be3b-2937-45df-85ea-ca7133ea542c", "shortName": "HeroDevs", "dateUpdated": "2026-09-01T14:57:01.340Z"}, "title": "jackson-databind omits java.lang.Comparable from DefaultBaseTypeLimitingValidator's unsafe base types", "datePublic": "2026-09-01T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-502", "description": "CWE-502 Deserialization of Untrusted Data", "type": "CWE"}]}, {"descriptions": [{"lang": "en", "cweId": "CWE-915", "description": "CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes", "type": "CWE"}]}], "affected": [{"vendor": "FasterXML", "product": "jackson-databind", "collectionURL": "https://repo.maven.apache.org/maven2", "packageName": "com.fasterxml.jackson.core:jackson-databind", "repo": "https://github.com/FasterXML/jackson-databind", "programFiles": ["src/main/java/com/fasterxml/jackson/databind/jsontype/DefaultBaseTypeLimitingValidator.java"], "programRoutines": [{"name": "com.fasterxml.jackson.databind.jsontype.DefaultBaseTypeLimitingValidator.isUnsafeBaseType"}], "versions": [{"status": "affected", "version": "2.11.0", "lessThan": "2.18.10", "versionType": "maven"}, {"status": "affected", "version": "2.19.0", "lessThan": "2.21.6", "versionType": "maven"}, {"status": "affected", "version": "2.22.0", "lessThan": "2.22.2", "versionType": "maven"}], "defaultStatus": "unaffected"}, {"vendor": "FasterXML", "product": "jackson-databind", "collectionURL": "https://repo.maven.apache.org/maven2", "packageName": "tools.jackson.core:jackson-databind", "repo": "https://github.com/FasterXML/jackson-databind", "programFiles": ["src/main/java/tools/jackson/databind/jsontype/DefaultBaseTypeLimitingValidator.java"], "programRoutines": [{"name": "tools.jackson.databind.jsontype.DefaultBaseTypeLimitingValidator.isUnsafeBaseType"}], "versions": [{"status": "affected", "version": "3.0.0", "lessThan": "3.1.6", "versionType": "maven"}, {"status": "affected", "version": "3.2.0", "lessThan": "3.2.2", "versionType": "maven"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "DefaultBaseTypeLimitingValidator is the PolymorphicTypeValidator applied automatically whenever @JsonTypeInfo is used without an explicitly configured custom validator. It denies polymorphic resolution only for a fixed set of \"unsafe base types\", and its isSafeSubType method returns true unconditionally for every base type outside that set. java.lang.Comparable was absent from the list despite being implemented by a very large fraction of JDK and application classes, comparable in breadth to java.io.Serializable, which is on the list for that reason. An application declaring an @JsonTypeInfo-annotated property or class with Comparable as its base type, and no custom PolymorphicTypeValidator, will accept a type identifier for essentially any class implementing Comparable. This yields an attacker-controlled object instantiation primitive; a demonstrated case constructs a java.io.File for an arbitrary attacker-chosen path, which becomes path-traversal-adjacent if the application subsequently calls path-sensitive methods on the value. No class implementing Comparable has been identified that yields code execution through deserialization alone. Global Default Typing via activateDefaultTyping is not affected, because that method structurally requires an explicit PolymorphicTypeValidator argument. This affects com.fasterxml.jackson.core:jackson-databind from 2.11.0 before 2.18.10, from 2.19.0 before 2.21.6, and from 2.22.0 before 2.22.2, and tools.jackson.core:jackson-databind from 3.0.0 before 3.1.6 and from 3.2.0 before 3.2.2. Users should upgrade to 2.18.10, 2.21.6, 2.22.2, 3.1.6, or 3.2.2.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>DefaultBaseTypeLimitingValidator is the PolymorphicTypeValidator applied automatically whenever @JsonTypeInfo is used without an explicitly configured custom validator. It denies polymorphic resolution only for a fixed set of \"unsafe base types\", and its isSafeSubType method returns true unconditionally for every base type outside that set. java.lang.Comparable was absent from the list despite being implemented by a very large fraction of JDK and application classes, comparable in breadth to java.io.Serializable, which is on the list for that reason. An application declaring an @JsonTypeInfo-annotated property or class with Comparable as its base type, and no custom PolymorphicTypeValidator, will accept a type identifier for essentially any class implementing Comparable. This yields an attacker-controlled object instantiation primitive; a demonstrated case constructs a java.io.File for an arbitrary attacker-chosen path, which becomes path-traversal-adjacent if the application subsequently calls path-sensitive methods on the value. No class implementing Comparable has been identified that yields code execution through deserialization alone. Global Default Typing via activateDefaultTyping is not affected, because that method structurally requires an explicit PolymorphicTypeValidator argument. This affects com.fasterxml.jackson.core:jackson-databind from 2.11.0 before 2.18.10, from 2.19.0 before 2.21.6, and from 2.22.0 before 2.22.2, and tools.jackson.core:jackson-databind from 3.0.0 before 3.1.6 and from 3.2.0 before 3.2.2. Users should upgrade to 2.18.10, 2.21.6, 2.22.2, 3.1.6, or 3.2.2.</p>"}]}], "references": [{"url": "https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-gx83-3vf8-gh7j", "name": "GHSA-gx83-3vf8-gh7j", "tags": ["third-party-advisory"]}, {"url": "https://github.com/FasterXML/jackson-databind/pull/6155", "name": "FasterXML/jackson-databind#6155", "tags": ["patch", "issue-tracking"]}, {"url": "https://github.com/FasterXML/jackson-databind/issues/6156", "name": "FasterXML/jackson-databind#6156", "tags": ["issue-tracking"]}, {"url": "https://github.com/FasterXML/jackson-databind/commit/eb3b7fc0f9c0d27f471550ac3316b17d1987388f", "name": "Fix commit (2.x line, forward-merged to 2.21, 2.22 and the 3.x branches)", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW", "baseSeverity": "MEDIUM", "baseScore": 5.6, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"}}], "workarounds": [{"lang": "en", "value": "Configure an explicit restrictive PolymorphicTypeValidator rather than relying on the default validator, or avoid declaring java.lang.Comparable as the base type of an @JsonTypeInfo-annotated property or class. Narrowing the declared base type to an application-specific interface also removes the exposure.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Configure an explicit restrictive PolymorphicTypeValidator rather than relying on the default validator, or avoid declaring java.lang.Comparable as the base type of an @JsonTypeInfo-annotated property or class. Narrowing the declared base type to an application-specific interface also removes the exposure.</p>"}]}], "solutions": [{"lang": "en", "value": "Upgrade to jackson-databind 2.18.10, 2.21.6, 2.22.2 (com.fasterxml.jackson.core) or 3.1.6, 3.2.2 (tools.jackson.core). The fix adds java.lang.Comparable to the UnsafeBaseTypes denylist in DefaultBaseTypeLimitingValidator, so polymorphic resolution against a Comparable base type is denied outright. 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Applications that legitimately need polymorphic handling of a Comparable-typed property must configure an explicit PolymorphicTypeValidator, for example a BasicPolymorphicTypeValidator with an allow-list of permitted subtypes.</p>"}]}], "timeline": [{"time": "2026-08-11T02:58:00.000Z", "lang": "en", "value": "Fix committed upstream (FasterXML/jackson-databind#6155)"}, {"time": "2026-09-01T00:00:00.000Z", "lang": "en", "value": "GitHub Security Advisory GHSA-gx83-3vf8-gh7j published by the maintainer"}], "credits": [{"lang": "en", "value": "prvazsahnazarov", "type": "reporter"}, {"lang": "en", "value": "Tatu Saloranta (cowtowncoder)", "type": "remediation developer"}], "source": {"discovery": "EXTERNAL"}}, "adp": [{"references": [{"url": "https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-gx83-3vf8-gh7j", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-01T17:46:23.527612Z", "id": "CVE-2026-83557", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-01T17:46:40.145Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-83557", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-01T17:46:23.527612Z"}}}], "references": [{"url": "https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-gx83-3vf8-gh7j", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-01T17:46:36.225Z"}}], "cna": {"title": "jackson-databind omits java.lang.Comparable from DefaultBaseTypeLimitingValidator's unsafe base types", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "reporter", "value": "prvazsahnazarov"}, {"lang": "en", "type": "remediation developer", "value": "Tatu Saloranta (cowtowncoder)"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.6, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://github.com/FasterXML/jackson-databind", "vendor": "FasterXML", "product": "jackson-databind", "versions": [{"status": "affected", "version": "2.11.0", "lessThan": "2.18.10", "versionType": "maven"}, {"status": "affected", "version": "2.19.0", "lessThan": "2.21.6", "versionType": "maven"}, {"status": "affected", "version": "2.22.0", "lessThan": "2.22.2", "versionType": "maven"}], "packageName": "com.fasterxml.jackson.core:jackson-databind", "programFiles": ["src/main/java/com/fasterxml/jackson/databind/jsontype/DefaultBaseTypeLimitingValidator.java"], "collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "programRoutines": [{"name": "com.fasterxml.jackson.databind.jsontype.DefaultBaseTypeLimitingValidator.isUnsafeBaseType"}]}, {"repo": "https://github.com/FasterXML/jackson-databind", "vendor": "FasterXML", "product": "jackson-databind", "versions": [{"status": "affected", "version": "3.0.0", "lessThan": "3.1.6", "versionType": "maven"}, {"status": "affected", "version": "3.2.0", "lessThan": "3.2.2", "versionType": "maven"}], "packageName": "tools.jackson.core:jackson-databind", "programFiles": ["src/main/java/tools/jackson/databind/jsontype/DefaultBaseTypeLimitingValidator.java"], "collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "programRoutines": [{"name": "tools.jackson.databind.jsontype.DefaultBaseTypeLimitingValidator.isUnsafeBaseType"}]}], "timeline": [{"lang": "en", "time": "2026-08-11T02:58:00.000Z", "value": "Fix committed upstream (FasterXML/jackson-databind#6155)"}, {"lang": "en", "time": "2026-09-01T00:00:00.000Z", "value": "GitHub Security Advisory GHSA-gx83-3vf8-gh7j published by the maintainer"}], "solutions": [{"lang": "en", "value": "Upgrade to jackson-databind 2.18.10, 2.21.6, 2.22.2 (com.fasterxml.jackson.core) or 3.1.6, 3.2.2 (tools.jackson.core). The fix adds java.lang.Comparable to the UnsafeBaseTypes denylist in DefaultBaseTypeLimitingValidator, so polymorphic resolution against a Comparable base type is denied outright. Applications that legitimately need polymorphic handling of a Comparable-typed property must configure an explicit PolymorphicTypeValidator, for example a BasicPolymorphicTypeValidator with an allow-list of permitted subtypes.", "supportingMedia": [{"type": "text/html", "value": "<p>Upgrade to jackson-databind 2.18.10, 2.21.6, 2.22.2 (com.fasterxml.jackson.core) or 3.1.6, 3.2.2 (tools.jackson.core). The fix adds java.lang.Comparable to the UnsafeBaseTypes denylist in DefaultBaseTypeLimitingValidator, so polymorphic resolution against a Comparable base type is denied outright. Applications that legitimately need polymorphic handling of a Comparable-typed property must configure an explicit PolymorphicTypeValidator, for example a BasicPolymorphicTypeValidator with an allow-list of permitted subtypes.</p>", "base64": false}]}], "datePublic": "2026-09-01T00:00:00.000Z", "references": [{"url": "https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-gx83-3vf8-gh7j", "name": "GHSA-gx83-3vf8-gh7j", "tags": ["third-party-advisory"]}, {"url": "https://github.com/FasterXML/jackson-databind/pull/6155", "name": "FasterXML/jackson-databind#6155", "tags": ["patch", "issue-tracking"]}, {"url": "https://github.com/FasterXML/jackson-databind/issues/6156", "name": "FasterXML/jackson-databind#6156", "tags": ["issue-tracking"]}, {"url": "https://github.com/FasterXML/jackson-databind/commit/eb3b7fc0f9c0d27f471550ac3316b17d1987388f", "name": "Fix commit (2.x line, forward-merged to 2.21, 2.22 and the 3.x branches)", "tags": ["patch"]}], "workarounds": [{"lang": "en", "value": "Configure an explicit restrictive PolymorphicTypeValidator rather than relying on the default validator, or avoid declaring java.lang.Comparable as the base type of an @JsonTypeInfo-annotated property or class. Narrowing the declared base type to an application-specific interface also removes the exposure.", "supportingMedia": [{"type": "text/html", "value": "<p>Configure an explicit restrictive PolymorphicTypeValidator rather than relying on the default validator, or avoid declaring java.lang.Comparable as the base type of an @JsonTypeInfo-annotated property or class. Narrowing the declared base type to an application-specific interface also removes the exposure.</p>", "base64": false}]}], "descriptions": [{"lang": "en", "value": "DefaultBaseTypeLimitingValidator is the PolymorphicTypeValidator applied automatically whenever @JsonTypeInfo is used without an explicitly configured custom validator. It denies polymorphic resolution only for a fixed set of \"unsafe base types\", and its isSafeSubType method returns true unconditionally for every base type outside that set. java.lang.Comparable was absent from the list despite being implemented by a very large fraction of JDK and application classes, comparable in breadth to java.io.Serializable, which is on the list for that reason. An application declaring an @JsonTypeInfo-annotated property or class with Comparable as its base type, and no custom PolymorphicTypeValidator, will accept a type identifier for essentially any class implementing Comparable. This yields an attacker-controlled object instantiation primitive; a demonstrated case constructs a java.io.File for an arbitrary attacker-chosen path, which becomes path-traversal-adjacent if the application subsequently calls path-sensitive methods on the value. No class implementing Comparable has been identified that yields code execution through deserialization alone. Global Default Typing via activateDefaultTyping is not affected, because that method structurally requires an explicit PolymorphicTypeValidator argument. This affects com.fasterxml.jackson.core:jackson-databind from 2.11.0 before 2.18.10, from 2.19.0 before 2.21.6, and from 2.22.0 before 2.22.2, and tools.jackson.core:jackson-databind from 3.0.0 before 3.1.6 and from 3.2.0 before 3.2.2. Users should upgrade to 2.18.10, 2.21.6, 2.22.2, 3.1.6, or 3.2.2.", "supportingMedia": [{"type": "text/html", "value": "<p>DefaultBaseTypeLimitingValidator is the PolymorphicTypeValidator applied automatically whenever @JsonTypeInfo is used without an explicitly configured custom validator. It denies polymorphic resolution only for a fixed set of \"unsafe base types\", and its isSafeSubType method returns true unconditionally for every base type outside that set. java.lang.Comparable was absent from the list despite being implemented by a very large fraction of JDK and application classes, comparable in breadth to java.io.Serializable, which is on the list for that reason. An application declaring an @JsonTypeInfo-annotated property or class with Comparable as its base type, and no custom PolymorphicTypeValidator, will accept a type identifier for essentially any class implementing Comparable. This yields an attacker-controlled object instantiation primitive; a demonstrated case constructs a java.io.File for an arbitrary attacker-chosen path, which becomes path-traversal-adjacent if the application subsequently calls path-sensitive methods on the value. No class implementing Comparable has been identified that yields code execution through deserialization alone. Global Default Typing via activateDefaultTyping is not affected, because that method structurally requires an explicit PolymorphicTypeValidator argument. This affects com.fasterxml.jackson.core:jackson-databind from 2.11.0 before 2.18.10, from 2.19.0 before 2.21.6, and from 2.22.0 before 2.22.2, and tools.jackson.core:jackson-databind from 3.0.0 before 3.1.6 and from 3.2.0 before 3.2.2. Users should upgrade to 2.18.10, 2.21.6, 2.22.2, 3.1.6, or 3.2.2.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-502", "description": "CWE-502 Deserialization of Untrusted Data"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-915", "description": "CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes"}]}], "providerMetadata": {"orgId": "36c7be3b-2937-45df-85ea-ca7133ea542c", "shortName": "HeroDevs", "dateUpdated": "2026-09-01T14:57:01.340Z"}}}, "cveMetadata": {"cveId": "CVE-2026-83557", "state": "PUBLISHED", "dateUpdated": "2026-09-01T17:46:40.145Z", "dateReserved": "2026-08-31T18:32:14.405Z", "assignerOrgId": "36c7be3b-2937-45df-85ea-ca7133ea542c", "datePublished": "2026-09-01T14:57:01.340Z", "assignerShortName": "HeroDevs"}, "dataVersion": "5.2"}

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It denies polymorphic resolution only for a fixed set of \"unsafe base types\", and its isSafeSubType method returns true unconditionally for every base type outside that set. java.lang.Comparable was absent from the list despite being implemented by a very large fraction of JDK and application classes, comparable in breadth to java.io.Serializable, which is on the list for that reason. An application declaring an @JsonTypeInfo-annotated property or class with Comparable as its base type, and no custom PolymorphicTypeValidator, will accept a type identifier for essentially any class implementing Comparable. This yields an attacker-controlled object instantiation primitive; a demonstrated case constructs a java.io.File for an arbitrary attacker-chosen path, which becomes path-traversal-adjacent if the application subsequently calls path-sensitive methods on the value. No class implementing Comparable has been identified that yields code execution through deserialization alone. 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Users should upgrade to 2.18.10, 2.21.6, 2.22.2, 3.1.6, or 3.2.2."}], "id": "CVE-2026-83557", "lastModified": "2026-09-08T19:29:32.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.4, "source": "36c7be3b-2937-45df-85ea-ca7133ea542c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-83557", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-01T17:46:23.527612Z", "version": "2.0.3"}}]}, "published": "2026-09-01T15:17:37.987", "references": [{"source": "36c7be3b-2937-45df-85ea-ca7133ea542c", "url": "https://github.com/FasterXML/jackson-databind/commit/eb3b7fc0f9c0d27f471550ac3316b17d1987388f"}, {"source": "36c7be3b-2937-45df-85ea-ca7133ea542c", "url": "https://github.com/FasterXML/jackson-databind/issues/6156"}, {"source": "36c7be3b-2937-45df-85ea-ca7133ea542c", "url": "https://github.com/FasterXML/jackson-databind/pull/6155"}, {"source": "36c7be3b-2937-45df-85ea-ca7133ea542c", "url": "https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-gx83-3vf8-gh7j"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-gx83-3vf8-gh7j"}], "sourceIdentifier": "36c7be3b-2937-45df-85ea-ca7133ea542c", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}, {"lang": "en", "value": "CWE-915"}], "source": "36c7be3b-2937-45df-85ea-ca7133ea542c", "type": "Secondary"}]}

{"bugzilla": {"description": "com.fasterxml.jackson.core/jackson-databind: tools.jackson.core/jackson-databind: jackson-databind: Path traversal via incomplete type validation", "id": "2526847", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526847"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L", "status": "draft"}, "cwe": "CWE-1287", "details": ["DefaultBaseTypeLimitingValidator is the PolymorphicTypeValidator applied automatically whenever @JsonTypeInfo is used without an explicitly configured custom validator. It denies polymorphic resolution only for a fixed set of \"unsafe base types\", and its isSafeSubType method returns true unconditionally for every base type outside that set. java.lang.Comparable was absent from the list despite being implemented by a very large fraction of JDK and application classes, comparable in breadth to java.io.Serializable, which is on the list for that reason. An application declaring an @JsonTypeInfo-annotated property or class with Comparable as its base type, and no custom PolymorphicTypeValidator, will accept a type identifier for essentially any class implementing Comparable. This yields an attacker-controlled object instantiation primitive; a demonstrated case constructs a java.io.File for an arbitrary attacker-chosen path, which becomes path-traversal-adjacent if the application subsequently calls path-sensitive methods on the value. No class implementing Comparable has been identified that yields code execution through deserialization alone. Global Default Typing via activateDefaultTyping is not affected, because that method structurally requires an explicit PolymorphicTypeValidator argument. This affects com.fasterxml.jackson.core:jackson-databind from 2.11.0 before 2.18.10, from 2.19.0 before 2.21.6, and from 2.22.0 before 2.22.2, and tools.jackson.core:jackson-databind from 3.0.0 before 3.1.6 and from 3.2.0 before 3.2.2. Users should upgrade to 2.18.10, 2.21.6, 2.22.2, 3.1.6, or 3.2.2.", "A flaw was found in jackson-databind. This vulnerability allows a remote attacker to control object creation by exploiting an incomplete list of restricted types in the DefaultBaseTypeLimitingValidator. By crafting malicious input, an attacker can cause the application to create arbitrary file objects, potentially leading to path traversal if these objects are then used in sensitive operations."], "name": "CVE-2026-83557", "package_state": [{"cpe": "cpe:/a:redhat:exploit_intelligence:0", "fix_state": "Out of support scope", "package_name": "exploit-intelligence/agent-client-rhel9", "product_name": "Exploit Intelligence"}, {"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Out of support scope", "package_name": "jenkins", "product_name": "OpenShift Developer Tools and Services"}, {"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Out of support scope", "package_name": "jenkins-2-plugins", "product_name": "OpenShift Developer Tools and Services"}, {"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Out of support scope", "package_name": "ocp-tools-4/jenkins-rhel8", "product_name": "OpenShift Developer Tools and Services"}, {"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Out of support scope", "package_name": "ocp-tools-4/jenkins-rhel9", "product_name": "OpenShift Developer Tools and Services"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "package_name": "openshift-serverless-1/kn-ekb-dispatcher-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "package_name": "openshift-serverless-1/kn-ekb-receiver-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "package_name": "openshift-serverless-1/kn-eventing-integrations-aws-ddb-streams-source-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "package_name": "openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "package_name": "openshift-serverless-1/kn-eventing-integrations-aws-s3-source-rhel9", 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"2026-09-01T14:57:01Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-83557\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-83557\nhttps://github.com/FasterXML/jackson-databind/commit/eb3b7fc0f9c0d27f471550ac3316b17d1987388f\nhttps://github.com/FasterXML/jackson-databind/issues/6156\nhttps://github.com/FasterXML/jackson-databind/pull/6155\nhttps://github.com/FasterXML/jackson-databind/security/advisories/GHSA-gx83-3vf8-gh7j"], "threat_severity": "Moderate"}