{"id":"CVE-2026-5438","state":"PUBLISHED","title":"Gzip Decompression Bomb via Content-Encoding Header","description":"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.","publishedAt":"2026-04-09T14:44:05.375Z","updatedAt":"2026-04-14T16:34:26.623Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"certcc","products":["Orthanc DICOM Server"],"affected":[{"vendor":"Orthanc","product":"DICOM Server","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.12.10","versionType":"custom"}]}],"references":["https://www.orthanc-server.com/","https://www.machinespirits.de/","https://kb.cert.org/vuls/id/536588"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/5xxx/CVE-2026-5438.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-5438","state":"PUBLISHED","datePublished":"2026-04-09T14:44:05.375Z","dateUpdated":"2026-04-14T16:34:26.623Z","assignerShortName":"certcc","assignerOrgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateReserved":"2026-04-02T19:21:58.543Z"},"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."}],"affected":[{"vendor":"Orthanc","product":"DICOM Server","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.12.10","versionType":"custom"}]}],"references":[{"url":"https://www.orthanc-server.com/"},{"url":"https://www.machinespirits.de/"},{"url":"https://kb.cert.org/vuls/id/536588"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-770 Allocation of Resources Without Limits or Throttling"}]}],"providerMetadata":{"shortName":"certcc","orgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateUpdated":"2026-04-09T14:44:05.375Z"},"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"VINCE 3.0.35","env":"prod","origin":"https://cveawg.mitre.org/api/cve/CVE-2026-5438"}},"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":{"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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-14T16:34:26.623Z"}}]}}}