CVE-2026-96636

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.

• CWE-400
• CWE-409

• https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48Patch
• https://github.com/python-pillow/Pillow/pull/10011Issue Tracking
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0Release Notes
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-p8hx-v2p6-rp84Vendor Advisory
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-p8hx-v2p6-rp84Vendor Advisory

Published

Oct 21, 2026

Last Modified

Oct 30, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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