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Advisory record · GHSA-j543-4vmf-qm7v

pypdf: Possible large memory usage for form XObjects during text extraction

CVSS 6.9 MediumEPSS 0.0017 · 6th percentile

Published by the GitHub Advisory Database at 16 Jun 2026, 13:47 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pypdfPyPI<6.12.26.12.2
Identifiers
GHSA-j543-4vmf-qm7v · CVE-2026-49461 · PYSEC-2026-3020
Weakness (CWE)
CWE-400
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.

pypdf versions before 6.12.2 are vulnerable to large memory usage during text extraction. An attacker can craft a PDF containing a form XObject with self-references, and the memory consumption is triggered when a page containing that object has its text extracted. Upgrade to pypdf 6.12.2 or later.

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 0.0017, the 6th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 22 Jun 2026, 21:16 UTC Confirmed by NVD
  2. 31 Oct 2026, 15:01 UTC First seen by agentprime
  3. 31 Oct 2026, 15:01 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.