{"id":"CVE-2026-96641","revision":"1b42ea8390de4382be92d0a94169beec","records":[{"revision":"1b42ea8390de4382be92d0a94169beec","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-96641","aliases":[],"title":"Pillow: Reachable undefined behavior in native integer operations, potentially leading to denial of service or logic integrity compromise","description":"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.","state":0,"publishedAt":"2026-10-21T20:51:24.388+00:00","modifiedAt":"2026-10-21T20:51:24.388+00:00","affected":[{"ecosystem":"Vendor product","name":"Pillow","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"python-pillow\",\n                    \"product\": \"Pillow\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 13.0.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rm8-3hmm-39fg","https://github.com/python-pillow/Pillow/pull/10010","https://github.com/python-pillow/Pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4","https://github.com/python-pillow/Pillow/releases/tag/13.0.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-96641","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-96641","identifiers":["CVE-2026-96641"]},"retained":false,"historicalAffected":[]}],"coverage":[]}