CVE-2026-112898

UNKNOWN 0.0

Pillow: Image.quantize() with empty palette leaks uninitialized stack memory

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

Pillow is a Python imaging library. From 9.1.0 until 13.0.0, Pillow can disclose uninitialized stack memory when Image.quantize() uses an empty palette. ImagingPaletteCacheUpdate() leaves a local cache array uninitialized when the palette has zero entries, and the conversion path emits those bytes as output pixel indices. An attacker who controls the palette image can obtain stack contents from a returned PNG or GIF. This can disclose addresses and stack-canary data without an out-of-bounds access, memory corruption, or process crash. This issue is fixed in version 13.0.0.

CWE	CWE-457
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

>= 9.1.0, < 13.0.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/python-pillow/Pillow/security/advisories/GHSA-rfgq-q3w2-pmv2 github.com: https://github.com/python-pillow/Pillow/commit/13943c8f857b22f073d30f0ef9b725a0d255f1a4 github.com: https://github.com/python-pillow/Pillow/releases/tag/13.0.0