CVE-2026-42311

Pillow: OOB Write with Invalid PSD Tile Extents (Integer Overflow)

State: Published
Severity: 8.6 High
Published: May 9, 2026
Updated: May 12, 2026
Reserved: Apr 26, 2026

Description

Pillow is a Python imaging library. From version 10.3.0 to before version 12.2.0, processing a malicious PSD file could lead to memory corruption, potentially resulting in a crash or arbitrary code execution. This issue has been patched in version 12.2.0.

Scores

CVSS	Score	Vector	Source
4.0	8.6 High	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-190 Integer Overflow or Wraparound
CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
Pillowpython-pillow	>= 10.3.0, < 12.2.0Affected

References

https://github.com/python-pillow/Pillow/security/advisories/GHSA-pwv6-vv43-88gr
https://github.com/python-pillow/Pillow/pull/9520
https://github.com/python-pillow/Pillow/commit/58f9a1d166dcb0c274807d4423522d205b0c35ea
https://github.com/python-pillow/Pillow/releases/tag/12.2.0

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