{"id":"CVE-2026-96643","summary":"Pillow: PNG eXIf chunk makes EXIF parsing run in quadratic time","details":"Pillow is a Python imaging library. From 11.0.0 until 13.0.0, Exif.load() in src/PIL/Image.py repeatedly slices the remaining EXIF data while it begins with the six-byte Exif header. src/PIL/PngImagePlugin.py accepts an uncapped PNG eXIf chunk, so a file filled with repeated headers causes a new shrinking copy on every iteration and quadratic CPU work. The condition is reachable through Image.getexif(), Image._getexif(), and ImageOps.exif_transpose(), including common photo-upload rotation workflows. This issue is fixed in version 13.0.0.","aliases":["GHSA-g4qv-2jxx-769h"],"modified":"2026-10-23T02:46:12.035772544Z","published":"2026-10-21T20:56:26.344Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96643.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-407"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96643.json"},{"type":"FIX","url":"https://github.com/python-pillow/Pillow/commit/806e38381c781f32bbd22f4cd026678acd40fd6c"},{"type":"FIX","url":"https://github.com/python-pillow/Pillow/pull/10073"},{"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-g4qv-2jxx-769h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96643"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python-pillow/pillow","events":[{"introduced":"204aae6682fc936f5350b3fe70335776f81480a7"},{"fixed":"293218ad059d994baf1777d882911bed6a49704a"},{"fixed":"806e38381c781f32bbd22f4cd026678acd40fd6c"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StringRangeExpression","range":[{"introduced":"11.0.0"},{"fixed":"13.0.0"}]},{"range":[{"fixed":"806e38381c781f32bbd22f4cd026678acd40fd6c"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"293218ad059d994baf1777d882911bed6a49704a"}],"source":"REFERENCES_TAG","original_tag":"13.0.0"}]}}],"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"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-96643.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}