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Advisory record · GHSA-jm82-fx9c-mx94

pypdf: Missing stream length values ignore defined limits

CVSS 6.9 MediumEPSS 0.0037 · 30th percentile

Published by the GitHub Advisory Database at 18 Jun 2026, 14:28 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pypdfPyPI<6.13.36.13.3
Identifiers
GHSA-jm82-fx9c-mx94 · CVE-2026-57204
Weakness (CWE)
CWE-400 · CWE-770
Tags
Published
18 Jun 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 6.13.3 can be made to use large amounts of memory when parsing a content stream that has no /Length value, because the MAX_DECLARED_STREAM_LENGTH limit is sometimes ignored. An attacker needs to supply a crafted PDF for the library to parse. Upgrade to pypdf 6.13.3 or later. The source does not describe a workaround that can be applied without patching.

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
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0037, the 30th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 30 Jun 2026, 22:16 UTC Confirmed by NVD
  2. 31 Oct 2026, 14:11 UTC First seen by agentprime
  3. 31 Oct 2026, 14:11 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.