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Advisory record · GHSA-9v9v-9qvf-h2hj

Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)

CVSS 7.1 HighEPSS 0.0038 · 32nd percentile

Published by the GitHub Advisory Database at 22 Oct 2026, 16:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pillowPyPI<13.0.013.0.0
Identifiers
GHSA-9v9v-9qvf-h2hj · BIT-pillow-2026-96644 · CVE-2026-96644 · PYSEC-2026-4343
Weakness (CWE)
CWE-125
Tags
Published
22 Oct 2026
Updated
29 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Pillow versions before 13.0.0 on Windows builds mishandle EMF and WMF image dimensions: the native drawwmf handler sizes its allocation from 16-bit truncated values but copies using the full 32-bit dimensions. An attacker who can get a crafted metafile opened by Pillow can trigger a heap over-read, which may leak memory or crash the process. Upgrade to Pillow 13.0.0 or later, which contains the fix.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.1 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0038, the 32nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.