{"id":"CVE-2026-96636","summary":"Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoImageFile.seek / DcxImageFile.seek)","details":"Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","aliases":["GHSA-p8hx-v2p6-rp84"],"modified":"2026-10-22T11:19:42.586056288Z","published":"2026-10-21T21:05:20.850Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-400","CWE-409"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96636.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96636.json"},{"type":"FIX","url":"https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48"},{"type":"FIX","url":"https://github.com/python-pillow/Pillow/pull/10011"},{"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-p8hx-v2p6-rp84"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96636"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python-pillow/pillow","events":[{"introduced":"0"},{"fixed":"293218ad059d994baf1777d882911bed6a49704a"},{"fixed":"f1acfc54c53502948d0d14121872061df931db48"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"fixed":"13.0.0"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"fixed":"f1acfc54c53502948d0d14121872061df931db48"}],"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/osv-test-cve-osv-conversion/osv-output/CVE-2026-96636.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}