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Advisory record · GHSA-g9xf-7f8q-9mcj

pypdf: Possible infinite loop when processing threads/articles in writer

CVSS 6.9 MediumEPSS 0.0016 · 5th percentile

Published by the GitHub Advisory Database at 9 Jul 2026, 21:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pypdfPyPI<6.13.16.13.1
Identifiers
GHSA-g9xf-7f8q-9mcj · CVE-2026-54651 · PYSEC-2026-3018
Weakness (CWE)
CWE-835
Tags
Published
9 Jul 2026
Updated
13 Jul 2026

Machine-written summary

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

pypdf versions before 6.13.1 can enter an infinite loop when processing a PDF with threads or articles that is merged into a writer. An attacker can exploit this by crafting such a PDF for a process that merges untrusted files, causing it to hang. Upgrade to pypdf 6.13.1 or later.

Written 6 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
6.9 Medium 4.0 CVSS:4.0/AV:L/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 0.0016, the 5th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 22 Jun 2026, 21:16 UTC Confirmed by NVD
  2. 31 Oct 2026, 15:03 UTC First seen by agentprime
  3. 31 Oct 2026, 15:03 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.