CVE-2026-96642

Pillow is a Python imaging library. Prior to 13.0.0, the TarIO initializer in src/PIL/TarIO.py accepts a negative octal member size and computes a backward seek that returns to the same 512-byte header. When the requested member name does not match, the parser repeatedly reads that header, consumes a full CPU core, and never returns. TarIO is reached only when an application directly uses PIL.TarIO.TarIO rather than the default Image.open() path. This issue is fixed in version 13.0.0.

• CWE-835

• https://github.com/python-pillow/Pillow/commit/19b695fdcc5eddc37374e2b1645fc4185edaf71dPatch
• https://github.com/python-pillow/Pillow/pull/10012Issue Tracking
• https://github.com/python-pillow/Pillow/releases/tag/13.0.0Release Notes
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-3j72-p6qg-6xp7Vendor Advisory
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-3j72-p6qg-6xp7Vendor 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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