{"id":"CVE-2026-65979","state":"PUBLISHED","title":"OpenEXR: Out-of-bounds read in HTJ2K decoder from unvalidated chunk header length (PLEN)","description":"OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. From version 3.4.0 through 3.4.12, the HTJ2K decoder parses a header-length field (PLEN) from a chunk's compressed data but never checks that this value fits within the available buffer before using it. When decoding, it advances the codestream pointer by the attacker-supplied header size and passes the resulting offset and remaining length to the OpenJPH memory-input path, so a crafted value pushes the pointer past the end of the buffer and causes an out-of-bounds read. Because this field comes straight from attacker-controlled EXR chunk data, the flaw is reachable during normal decoding of an untrusted file. This issue is fixed in version 3.4.13.","publishedAt":"2026-08-25T18:58:25.871Z","updatedAt":"2026-08-25T19:16:25.169Z","severity":{"score":6.7,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["AcademySoftwareFoundation openexr"],"affected":[{"vendor":"AcademySoftwareFoundation","product":"openexr","versions":[{"version":">= 3.4.0, < 3.4.13","status":"affected"}]}],"references":["https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3j9c-j7c9-x293","https://github.com/AcademySoftwareFoundation/openexr/commit/c7af2d233b7b2a4452c11f26cf47584cc2b35721","https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.13"],"weaknesses":["CWE-20","CWE-125"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/65xxx/CVE-2026-65979.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-65979","state":"PUBLISHED","datePublished":"2026-08-25T18:58:25.871Z","dateUpdated":"2026-08-25T19:16:25.169Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-23T18:54:15.831Z"},"containers":{"cna":{"title":"OpenEXR: Out-of-bounds read in HTJ2K decoder from unvalidated chunk header length (PLEN)","descriptions":[{"lang":"en","value":"OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. From version 3.4.0 through 3.4.12, the HTJ2K decoder parses a header-length field (PLEN) from a chunk's compressed data but never checks that this value fits within the available buffer before using it. When decoding, it advances the codestream pointer by the attacker-supplied header size and passes the resulting offset and remaining length to the OpenJPH memory-input path, so a crafted value pushes the pointer past the end of the buffer and causes an out-of-bounds read. Because this field comes straight from attacker-controlled EXR chunk data, the flaw is reachable during normal decoding of an untrusted file. This issue is fixed in version 3.4.13."}],"affected":[{"vendor":"AcademySoftwareFoundation","product":"openexr","versions":[{"version":">= 3.4.0, < 3.4.13","status":"affected"}]}],"references":[{"url":"https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3j9c-j7c9-x293","name":"https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3j9c-j7c9-x293","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/AcademySoftwareFoundation/openexr/commit/c7af2d233b7b2a4452c11f26cf47584cc2b35721","name":"https://github.com/AcademySoftwareFoundation/openexr/commit/c7af2d233b7b2a4452c11f26cf47584cc2b35721","tags":["x_refsource_MISC"]},{"url":"https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.13","name":"https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.13","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.7,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20: Improper Input Validation","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125: Out-of-bounds Read","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-25T18:58:25.871Z"},"source":{"advisory":"GHSA-3j9c-j7c9-x293","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3j9c-j7c9-x293","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T19:16:04.681091Z","id":"CVE-2026-65979","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-25T19:16:25.169Z"}}]}}}