PYSEC-2026-4342

En bref

Publiée: 2026-10-21 21:20 UTC
Mise à jour: 2026-10-28 11:00 UTC
CVE: CVE-2026-96643
Alias: GHSA-g4qv-2jxx-769h
CVSS_V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Description

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.

Paquets affectés

Paquet	Versions
PyPI · pillow	introduced 11.0.0, fixed 13.0.0

Références

https://github.com/python-pillow/Pillow/releases/tag/13.0.0 ADVISORY
https://github.com/python-pillow/Pillow/security/advisories/GHSA-g4qv-2jxx-769h ADVISORY
https://github.com/python-pillow/Pillow/pull/10073 REPORT
https://github.com/python-pillow/Pillow/commit/806e38381c781f32bbd22f4cd026678acd40fd6c FIX

Sources

Source	Licence
OSV.dev	CC-BY 4.0 — PyPA Advisory Database