CVE-2026-112401

UNKNOWN 0.0

Pillow: Quadratic GIF comment concatenation allows DoS in Image.open()

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

Pillow is a Python imaging library. From 5.4.0 until 13.0.0, Pillow performs quadratic copying while parsing GIF comments. GifImageFile._seek() repeatedly appends immutable bytes for comment sub-blocks and multiple comment extensions, and frame zero is parsed during Image.open(). An attacker can submit a small-dimension GIF containing many comment extensions to any application that opens the file. This can consume excessive CPU and deny service before the application can inspect the image. This issue is fixed in version 13.0.0.

CWE	CWE-407
Vendor	python-pillow
Product	pillow
Published	Oct 19, 2026

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Affected Versions

python-pillow / Pillow

>= 5.4.0, < 13.0.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/python-pillow/Pillow/security/advisories/GHSA-74r2-7ff9-mjj2 github.com: https://github.com/python-pillow/Pillow/commit/68a3fe957d8a4d552e8c69d96066d749f0614c7e github.com: https://github.com/python-pillow/Pillow/releases/tag/13.0.0