{"id":"CVE-2026-34544","aliases":["GHSA-h762-rhv3-h25v","PYSEC-2026-2847"],"url":"https://o3.security/vulnerability/CVE-2026-34544","summary":"OpenEXR: integer overflow to OOB write in uncompress_b44_impl()","details":"OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.8, a crafted B44 or B44A EXR file can cause an out-of-bounds write in any application that decodes it via exr_decoding_run(). Consequences range from immediate crash (most likely) to corruption of adjacent heap allocations (layout-dependent). This issue has been patched in version 3.4.8.","published":"2026-04-01T20:55:30.493Z","modified":"2026-09-18T14:02:29.483524Z","cvss":null,"epss":{"score":0.00244,"percentile":0.15811,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"openexr","fixedVersion":"3.4.8"},{"ecosystem":"PyPI","name":"openexr","fixedVersion":null},{"ecosystem":"PyPI","name":"openexr","fixedVersion":null}],"fix":{"url":"https://github.com/AcademySoftwareFoundation/openexr/commit/35e7aa35e22c1975606be86e859f31cc1fc598ee","label":"AcademySoftwareFoundation/openexr@35e7aa3"},"references":[{"type":"WEB","url":"https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.8"},{"type":"ADVISORY","url":"https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-h762-rhv3-h25v"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34544.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34544"},{"type":"FIX","url":"https://github.com/AcademySoftwareFoundation/openexr/commit/35e7aa35e22c1975606be86e859f31cc1fc598ee"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-18T14:02:29.483524Z"}}