{"id":"CVE-2026-44663","summary":"OpenEXR: Integer overflow in the HTJ2K decoder leads to heap-buffer-overflow","details":"OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions 3.4.0 through 3.4.11, an integer overflow in ht_undo_impl() in src/lib/OpenEXRCore/internal_ht.cpp leads to a heap-buffer overflow when decoding a crafted HTJ2K-compressed EXR file. decode-\u003echannels[i].width (int32_t) is multiplied by bytes_per_element in 32-bit signed arithmetic. With large widths (e.g., \u003e= 536870912 for FLOAT data), this overflows, producing a corrupted offset that is later used for pointer arithmetic and can cause a heap out-of-bounds write. The same unchecked multiplication pattern appears in two other HTJ2K paths (bytes-per-line accumulation and pixel-line pointer advancement). As with related CVE-2026-34378 through CVE-2026-34589 fixes in other codecs, validating only after the multiplication is too late because the value may already be overflowed. This issue has been fixed in version 3.4.12.","aliases":["GHSA-777r-f9x8-7r84"],"modified":"2026-07-08T08:13:09.323913Z","published":"2026-06-18T20:20:15.532Z","related":["openSUSE-SU-2026:10985-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44663.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-190","CWE-787"]},"references":[{"type":"WEB","url":"https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.12"},{"type":"ADVISORY","url":"https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-777r-f9x8-7r84"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44663.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44663"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/academysoftwarefoundation/openexr","events":[{"introduced":"20a65852895894434bea88613f6d29ac8e88bd6e"},{"fixed":"d25e2a83b5a5f0eb9e350de8218fa27c348da203"}],"database_specific":{"extracted_events":[{"introduced":"3.4.0"},{"fixed":"3.4.11"},{"fixed":"3.4.12"}],"source":["AFFECTED_FIELD","CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*"}}],"versions":["v3.4.11-rc2","v3.4.11-rc","v3.4.10-rc","v3.4.10","v3.4.9","v3.4.9-rc","v3.4.8-rc","v3.4.8","v3.4.7","v3.4.7-rc","v3.4.6","v3.4.6-rc","v3.4.5","v3.4.5-rc","v3.4.4-rc2","v3.4.4","v3.4.4-rc","v3.4.3-rc3","v3.4.3","v3.4.3-rc2","v3.4.3-rc","v3.4.2-rc2","v3.4.2","v3.4.2-rc","v3.4.1-rc2","v3.4.1","v3.4.1-rc","v3.4.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44663.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H"}]}