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Advisory record · GHSA-wjqc-6w8f-h24c

pypdf: Manipulated XMP metadata streams can exhaust RAM

CVSS 6.9 MediumEPSS 0.0013 · 2nd percentile

Published by the GitHub Advisory Database at 16 Jun 2026, 13:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pypdfPyPI<6.12.16.12.1
Identifiers
GHSA-wjqc-6w8f-h24c · CVE-2026-48735 · PYSEC-2026-3025
Weakness (CWE)
CWE-770
Tags
Published
16 Jun 2026
Updated
13 Jul 2026

Machine-written summary

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

The pypdf package, versions before 6.12.1, can use very large amounts of memory when parsing a PDF with manipulated XMP metadata streams. An attacker who supplies a crafted PDF can exhaust RAM, which requires the victim's application to parse that file. Upgrade to pypdf 6.12.1 or later. The source gives no other workaround that the reader can apply directly.

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 0.0013, the 2nd percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 28 May 2026, 16:16 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.