{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45447", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-05-12T14:34:06.277Z", "datePublished": "2026-06-09T16:03:32.914Z", "dateUpdated": "2026-06-10T07:48:15.381Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.1", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.3", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.7", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.6", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.0.21", "status": "affected", "version": "3.0.0", "versionType": "semver"}, {"lessThan": "1.1.1zh", "status": "affected", "version": "1.1.1", "versionType": "custom"}, {"lessThan": "1.0.2zq", "status": "affected", "version": "1.0.2", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Thai Duong (Calif.io in collaboration with Claude and Anthropic Research)"}, {"lang": "en", "type": "remediation developer", "value": "Igor Ustinov"}], "datePublic": "2026-06-09T14:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: A specially crafted PKCS#7 or S/MIME signed message could<br>trigger a use-after-free during PKCS#7 signature verification.<br><br>Impact summary: A use-after-free may result in process crashes, heap<br>corruption, or potentially remote code execution.<br><br>When processing a PKCS#7 or S/MIME signed message, if the SignedData<br>digestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may<br>incorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent<br>use of the BIO by the calling application results in a use-after-free<br>condition.<br><br>In the common case this occurs when the application later calls<br>BIO_free() on the BIO originally passed to PKCS7_verify(). Depending<br>on allocator behavior and application-specific BIO usage patterns, this<br>may result in a crash or other memory corruption. In some application<br>contexts this may potentially be exploitable for remote code execution.<br><br>Applications that process PKCS#7 or S/MIME signed messages using OpenSSL<br>PKCS#7 APIs may be affected. Applications using the CMS APIs for this<br>processing are not affected.<br><br>The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this<br>issue, as the affected code is outside the OpenSSL FIPS module boundary."}], "value": "Issue summary: A specially crafted PKCS#7 or S/MIME signed message could\ntrigger a use-after-free during PKCS#7 signature verification.\n\nImpact summary: A use-after-free may result in process crashes, heap\ncorruption, or potentially remote code execution.\n\nWhen processing a PKCS#7 or S/MIME signed message, if the SignedData\ndigestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may\nincorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent\nuse of the BIO by the calling application results in a use-after-free\ncondition.\n\nIn the common case this occurs when the application later calls\nBIO_free() on the BIO originally passed to PKCS7_verify(). Depending\non allocator behavior and application-specific BIO usage patterns, this\nmay result in a crash or other memory corruption. In some application\ncontexts this may potentially be exploitable for remote code execution.\n\nApplications that process PKCS#7 or S/MIME signed messages using OpenSSL\nPKCS#7 APIs may be affected. Applications using the CMS APIs for this\nprocessing are not affected.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\nissue, as the affected code is outside the OpenSSL FIPS module boundary."}], "metrics": [{"format": "other", "other": {"content": {"text": "High"}, "type": "https://openssl-library.org/policies/general/security-policy/"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-416", "description": "CWE-416 Use After Free", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-06-10T07:48:15.381Z"}, "references": [{"name": "OpenSSL Advisory", "tags": ["vendor-advisory"], "url": "https://openssl-library.org/news/secadv/20260609.txt"}, {"name": "4.0.1 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/3aad5eb7af4de4ee0633c30a8541a54d9bbde63c"}, {"name": "3.6.3 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/c505d7559da5d5f9f2c3913c6883a5562ce7273e"}, {"name": "3.5.7 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/7d4a980c62258c5910cc883936e0c8dbab4d75a8"}, {"name": "3.4.6 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/a541ae8bfe849a30cc885e8780715c0f488e496c"}, {"name": "3.0.21 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/9dfd688ad2290fc5075cacbc9bf0c9a93eefed54"}], "source": {"discovery": "UNKNOWN"}, "title": "Heap Use-After-Free in the PKCS7_verify() Function", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-06-09T00:00:00+00:00", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-45447"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-10T03:59:37.431Z"}}]}}

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A subsequent\nuse of the BIO by the calling application results in a use-after-free\ncondition.\n\nIn the common case this occurs when the application later calls\nBIO_free() on the BIO originally passed to PKCS7_verify(). Depending\non allocator behavior and application-specific BIO usage patterns, this\nmay result in a crash or other memory corruption. In some application\ncontexts this may potentially be exploitable for remote code execution.\n\nApplications that process PKCS#7 or S/MIME signed messages using OpenSSL\nPKCS#7 APIs may be affected. Applications using the CMS APIs for this\nprocessing are not affected.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\nissue, as the affected code is outside the OpenSSL FIPS module boundary.", "supportingMedia": [{"type": "text/html", "value": "Issue summary: A specially crafted PKCS#7 or S/MIME signed message could<br>trigger a use-after-free during PKCS#7 signature verification.<br><br>Impact summary: A use-after-free may result in process crashes, heap<br>corruption, or potentially remote code execution.<br><br>When processing a PKCS#7 or S/MIME signed message, if the SignedData<br>digestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may<br>incorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent<br>use of the BIO by the calling application results in a use-after-free<br>condition.<br><br>In the common case this occurs when the application later calls<br>BIO_free() on the BIO originally passed to PKCS7_verify(). Depending<br>on allocator behavior and application-specific BIO usage patterns, this<br>may result in a crash or other memory corruption. In some application<br>contexts this may potentially be exploitable for remote code execution.<br><br>Applications that process PKCS#7 or S/MIME signed messages using OpenSSL<br>PKCS#7 APIs may be affected. Applications using the CMS APIs for this<br>processing are not affected.<br><br>The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this<br>issue, as the affected code is outside the OpenSSL FIPS module boundary.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-06-10T07:48:15.381Z"}}}, "cveMetadata": {"cveId": "CVE-2026-45447", "state": "PUBLISHED", "dateUpdated": "2026-06-10T07:48:15.381Z", "dateReserved": "2026-05-12T14:34:06.277Z", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "datePublished": "2026-06-09T16:03:32.914Z", "assignerShortName": "openssl"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Issue summary: A specially crafted PKCS#7 or S/MIME signed message could\ntrigger a use-after-free during PKCS#7 signature verification.\n\nImpact summary: A use-after-free may result in process crashes, heap\ncorruption, or potentially remote code execution.\n\nWhen processing a PKCS#7 or S/MIME signed message, if the SignedData\ndigestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may\nincorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent\nuse of the BIO by the calling application results in a use-after-free\ncondition.\n\nIn the common case this occurs when the application later calls\nBIO_free() on the BIO originally passed to PKCS7_verify(). Depending\non allocator behavior and application-specific BIO usage patterns, this\nmay result in a crash or other memory corruption. In some application\ncontexts this may potentially be exploitable for remote code execution.\n\nApplications that process PKCS#7 or S/MIME signed messages using OpenSSL\nPKCS#7 APIs may be affected. Applications using the CMS APIs for this\nprocessing are not affected.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\nissue, as the affected code is outside the OpenSSL FIPS module boundary."}], "id": "CVE-2026-45447", "lastModified": "2026-06-10T08:16:24.927", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-06-09T17:17:19.277", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/3aad5eb7af4de4ee0633c30a8541a54d9bbde63c"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/7d4a980c62258c5910cc883936e0c8dbab4d75a8"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/9dfd688ad2290fc5075cacbc9bf0c9a93eefed54"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/a541ae8bfe849a30cc885e8780715c0f488e496c"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/c505d7559da5d5f9f2c3913c6883a5562ce7273e"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260609.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

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