{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-5438", "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b", "state": "PUBLISHED", "assignerShortName": "certcc", "dateReserved": "2026-04-02T19:21:58.543Z", "datePublished": "2026-04-09T14:44:05.375Z", "dateUpdated": "2026-04-14T16:34:26.623Z"}, "containers": {"cna": {"title": "Gzip Decompression Bomb via Content-Encoding Header", "descriptions": [{"lang": "en", "value": "A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`. The server does not enforce limits on decompressed size and allocates memory based on attacker-controlled compression metadata. A specially crafted gzip payload can trigger excessive memory allocation and exhaust system memory."}], "source": {"discovery": "UNKNOWN"}, "affected": [{"vendor": "Orthanc", "product": "DICOM Server", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "1.12.10", "versionType": "custom"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-770 Allocation of Resources Without Limits or Throttling"}]}], "references": [{"url": "https://www.orthanc-server.com/"}, {"url": "https://www.machinespirits.de/"}, {"url": "https://kb.cert.org/vuls/id/536588"}], "x_generator": {"engine": "VINCE 3.0.35", "env": "prod", "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-5438"}, "providerMetadata": {"orgId": "37e5125f-f79b-445b-8fad-9564f167944b", "shortName": "certcc", "dateUpdated": "2026-04-09T14:44:05.375Z"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-14T15:13:20.018057Z", "id": "CVE-2026-5438", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"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": "2026-04-14T16:34:26.623Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-5438", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-14T15:13:20.018057Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-14T15:13:15.906Z"}}], "cna": {"title": "Gzip Decompression Bomb via Content-Encoding Header", "source": {"discovery": "UNKNOWN"}, "affected": [{"vendor": "Orthanc", "product": "DICOM Server", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "1.12.10"}]}], "references": [{"url": "https://www.orthanc-server.com/"}, {"url": "https://www.machinespirits.de/"}, {"url": "https://kb.cert.org/vuls/id/536588"}], "x_generator": {"env": "prod", "engine": "VINCE 3.0.35", "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-5438"}, "descriptions": [{"lang": "en", "value": "A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`. The server does not enforce limits on decompressed size and allocates memory based on attacker-controlled compression metadata. A specially crafted gzip payload can trigger excessive memory allocation and exhaust system memory."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-770 Allocation of Resources Without Limits or Throttling"}]}], "providerMetadata": {"orgId": "37e5125f-f79b-445b-8fad-9564f167944b", "shortName": "certcc", "dateUpdated": "2026-04-09T14:44:05.375Z"}}}, "cveMetadata": {"cveId": "CVE-2026-5438", "state": "PUBLISHED", "dateUpdated": "2026-04-14T16:34:26.623Z", "dateReserved": "2026-04-02T19:21:58.543Z", "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b", "datePublished": "2026-04-09T14:44:05.375Z", "assignerShortName": "certcc"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:*", "matchCriteriaId": "A259075D-8B77-4B04-BC42-3E5ABE9DFE1F", "versionEndExcluding": "1.12.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`. The server does not enforce limits on decompressed size and allocates memory based on attacker-controlled compression metadata. A specially crafted gzip payload can trigger excessive memory allocation and exhaust system memory."}], "id": "CVE-2026-5438", "lastModified": "2026-04-15T19:31:48.380", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-04-09T15:16:15.327", "references": [{"source": "cret@cert.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "https://kb.cert.org/vuls/id/536588"}, {"source": "cret@cert.org", "tags": ["Not Applicable"], "url": "https://www.machinespirits.de/"}, {"source": "cret@cert.org", "tags": ["Product"], "url": "https://www.orthanc-server.com/"}], "sourceIdentifier": "cret@cert.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}