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Advisory record · GHSA-58r4-6rv3-gfh8

Pillow: Out-of-bounds access in _imagingmorph on a zero-width image

CVSS 8.7 HighEPSS 0.0057 · 47th percentile

Published by the GitHub Advisory Database at 20 Oct 2026, 20:56 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-58r4-6rv3-gfh8 · BIT-pillow-2026-112397 · CVE-2026-112397 · PYSEC-2026-4329
Weakness (CWE)
CWE-787
Tags
Published
20 Oct 2026
Updated
28 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 can crash when a morphology operation is applied to a zero-width PPM or PGM image, because the native code writes outside its row buffer. An attacker who can supply an image file to an application that runs ImageMorph.MorphOp.apply() on it can cause a crash and possibly memory corruption. The fix is to upgrade to Pillow 13.0.0 or later.

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
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0057, the 47th 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.