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Advisory record · GHSA-mrfp-p49p-3hf2

Pillow PDF append accepts malformed shared page-tree DAG causing resource exhaustion

CVSS 8.2 HighEPSS 0.0060 · 49th percentile

Published by the GitHub Advisory Database at 22 Oct 2026, 16:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pillowPyPI>=5.1.0, <13.0.013.0.0
Identifiers
GHSA-mrfp-p49p-3hf2 · BIT-pillow-2026-96640 · CVE-2026-96640
Weakness (CWE)
CWE-400 · CWE-407
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 5.1.0 up to but not including 13.0.0 are affected when appending to an existing PDF. An attacker who can supply a PDF to an application that uses Image.save with format="PDF" and append=True can provide a malformed page tree that makes Pillow use excessive CPU time, causing resource exhaustion. 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
8.2 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 0.0060, the 49th 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.