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Advisory record · GHSA-j4m9-6w36-pw47

Pillow: Invalid free in FreeType glyph rendering when a stroker is active

CVSS 8.2 HighEPSS 0.0055 · 46th percentile

Published by the GitHub Advisory Database at 21 Oct 2026, 20:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pillowPyPI>=10.0.0, <13.0.013.0.0
Identifiers
GHSA-j4m9-6w36-pw47 · BIT-pillow-2026-112893 · CVE-2026-112893
Weakness (CWE)
CWE-457 · CWE-763
Tags
Published
21 Oct 2026
Updated
26 Oct 2026

Machine-written summary

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

Pillow versions 10.0.0 up to 13.0.0 (fixed in 13.0.0) have an invalid free in FreeType glyph rendering when text is drawn with a non-zero stroke width. An attacker who can supply a malformed font, such as through an application that loads fonts from untrusted bytes, can trigger a free of an uninitialized or stale pointer, which may crash the process. Upgrade to Pillow 13.0.0 or later. The source gives few details on exploitation beyond this.

Written 1 Nov 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
8.2 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0055, the 46th percentile, on 7 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.