Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-fwg2-594c-jp42

pypdf: Possible long runtimes/large memory usage for large CID font width ranges

CVSS 4.8 MediumEPSS 0.0013 · 2nd percentile

Published by the GitHub Advisory Database at 7 Aug 2026, 18:54 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pypdfPyPI<6.15.06.15.0
Identifiers
GHSA-fwg2-594c-jp42 · CVE-2026-71852 · PYSEC-2026-3656
Weakness (CWE)
CWE-834
Tags
Published
7 Aug 2026
Updated
10 Sept 2026

Machine-written summary

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

pypdf versions before 6.15.0 are vulnerable. An attacker can craft a PDF with unusually large CID font width entries that, when parsed during operations such as text extraction, causes long runtimes and high memory consumption. Upgrade to pypdf 6.15.0 or later. The source's workaround refers to a code change that the reader would need to apply manually, so it is not included here.

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
4.8 Medium 4.0 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0013, the 2nd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 7 Aug 2026, 19:18 UTC Confirmed by NVD
  2. 31 Oct 2026, 14:10 UTC First seen by agentprime
  3. 31 Oct 2026, 14:10 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.