CVE-2026-112399

UNKNOWN 0.0

Pillow: APNG background disposal allocates full canvas before decompression bomb check

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

Pillow is a Python imaging library. From 8.1.0 until 13.0.0, Pillow can allocate an APNG disposal background at the full canvas size before applying the decompression-bomb check. A crafted APNG with a small first frame, a very large declared canvas, and background disposal or first-frame OP_PREVIOUS reaches PngImageFile._seek while Image.open() positions frame zero. The full-canvas allocation occurs inside Image.open() without requiring pixel loading or frame iteration. This can exhaust memory and deny service. This issue is fixed in version 13.0.0.

CWE	CWE-789
Vendor	python-pillow
Product	pillow
Published	Oct 19, 2026

Stay Ahead of the Next One

Get instant alerts for python-pillow pillow

Be the first to know when new unknown vulnerabilities affecting python-pillow pillow are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

python-pillow / Pillow

>= 8.1.0, < 13.0.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9 github.com: https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48 github.com: https://github.com/python-pillow/Pillow/releases/tag/13.0.0