{"id":"CVE-2026-96641","summary":"Pillow: Reachable undefined behavior in native integer operations, potentially leading to denial of service or logic integrity compromise","details":"Pillow is a Python imaging library. Prior to 13.0.0, PILfont text-width accumulation in src/_imaging.c checks positive glyph advances against INT_MAX but does not check negative advances against INT_MIN. Repeating a signed 16-bit advance of -32768 can therefore execute a signed C integer overflow in xsize += dx, producing a large positive width from a negative mathematical result. Applications that use getlength(), getsize(), or derived layout, quota, serialization, or allocation calculations can experience logic-integrity errors or resource consumption, while the high-level mask path commonly retains a decompression-bomb check. This issue is fixed in version 13.0.0.","aliases":["GHSA-4rm8-3hmm-39fg"],"modified":"2026-10-22T13:12:17.601543006Z","published":"2026-10-21T20:51:24.388Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96641.json","unresolved_ranges":[{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StringRangeExpression","range":[{"fixed":"13.0.0"}]}]},{"extracted_events":[{"range":[{"fixed":"13.0.0"},{"fixed":"13.0.0"}],"source":"DESCRIPTION"}]}],"cna_assigner":"GitHub_M","cwe_ids":["CWE-190"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96641.json"},{"type":"FIX","url":"https://github.com/python-pillow/Pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4"},{"type":"FIX","url":"https://github.com/python-pillow/Pillow/pull/10010"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/releases/tag/13.0.0"},{"type":"ADVISORY","url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rm8-3hmm-39fg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96641"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python-pillow/pillow","events":[{"introduced":"0"},{"fixed":"80de4be9e38d3a6148dd4d8491eb80cd12b760a4"},{"fixed":"293218ad059d994baf1777d882911bed6a49704a"}],"database_specific":{"extracted_events":[{"range":[{"fixed":"80de4be9e38d3a6148dd4d8491eb80cd12b760a4"}],"source":"REFERENCES_COMMIT"},{"original_tag":"13.0.0","range":[{"fixed":"293218ad059d994baf1777d882911bed6a49704a"}],"source":"REFERENCES_TAG"}]}}],"versions":["12.3.0","12.2.0","12.1.0","12.0.0","11.3.0","11.2.1","11.1.0","11.0.0","10.4.0","10.3.0","10.2.0","10.1.0","10.0.0","9.5.0","9.4.0","9.3.0","9.2.0","9.1.0","9.0.0","8.4.0","8.3.0","8.2.0","8.1.0","8.0.0","7.2.0","7.1.0","7.0.0","6.2.0","6.1.0","6.0.0","5.4.0","5.3.0","5.2.0","5.1.0","5.0.0","4.3.0","4.2.0","4.1.0","4.0.0","4.0.0a","3.4.0","3.3.0","3.2.0","3.1.0","3.1.0-rc1","2.9.0","2.9.0.dev2","2.9.0.dev1","2.9.0.dev0","2.8.1","2.8.0","2.7.0","2.5.0","2.3.0","2.2.1","2.2.0","2.1.0","2.0.0","1.7.8","1.7.7","1.2","1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-96641.json","vanir_signatures":[{"source":"https://github.com/python-pillow/pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4","target":{"function":"textwidth","file":"src/_imaging.c"},"deprecated":false,"digest":{"function_hash":"24350347155157544042205301785092810593","length":348},"id":"CVE-2026-96641-92e707e4","signature_type":"Function","signature_version":"v1"},{"source":"https://github.com/python-pillow/pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4","target":{"file":"src/_imaging.c"},"deprecated":false,"digest":{"line_hashes":["162774002408016075706002191493050065701","301949638008089508114074403907582014158","286992270447891107750639652328547358814","60831605151601509104656217485518928052"],"threshold":0.9},"id":"CVE-2026-96641-f2ae6064","signature_type":"Line","signature_version":"v1"}],"vanir_signatures_modified":"2026-10-22T13:12:17Z"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}