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Advisory record · GHSA-6c7f-9265-g8fw

pypdf: Possible long runtimes for repeated references to the same missing object

CVSS 7.1 HighEPSS 0.0037 · 31st percentile

Published by the GitHub Advisory Database at 23 Oct 2026, 20:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pypdfPyPI<6.21.26.21.2
Identifiers
GHSA-6c7f-9265-g8fw · CVE-2026-115572
Weakness (CWE)
CWE-400
Tags
Published
23 Oct 2026
Updated
23 Oct 2026

Machine-written summary

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

pypdf versions before 6.21.2 can take a very long time to process certain PDFs. An attacker who supplies a crafted PDF can trigger this when the file is loaded, particularly when parts such as pages are read and the same non-existent indirect object is referenced repeatedly. Upgrade to pypdf 6.21.2 or later to fix the issue.

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
7.1 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0037, the 31st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 23 Oct 2026, 20:17 UTC Confirmed by NVD
  2. 31 Oct 2026, 14:08 UTC First seen by agentprime
  3. 31 Oct 2026, 14:08 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.