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Advisory record · GHSA-jr96-gvgh-j3r4

pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)

CVSS 7.1 HighEPSS 0.0041 · 35th percentile

Published by the GitHub Advisory Database at 23 Oct 2026, 20:54 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-jr96-gvgh-j3r4 · CVE-2026-115585
Weakness (CWE)
CWE-400 · CWE-407
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.

The pypdf package before 6.21.2 is vulnerable to long processing times when it parses a PDF containing repeated malformed cross-reference stream entries. An attacker who can supply a crafted PDF for pypdf to process can cause it to run for a long time. Upgrade to pypdf 6.21.2 or later. The advisory's workaround, applying the changes from a referenced pull request, is not something most readers can apply directly.

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 0.0041, the 35th 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.