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Advisory record · GHSA-5hgr-hg42-57jg

pypdf: Inefficient decoding of FlateDecode PNG predictor streams

CVSS 5.1 MediumEPSS 0.0017 · 5th percentile

Published by the GitHub Advisory Database at 16 Jun 2026, 13:46 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-5hgr-hg42-57jg · CVE-2026-49460 · PYSEC-2026-3010
Weakness (CWE)
CWE-407
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 inefficient decoding of FlateDecode streams that use a PNG predictor. An attacker who supplies a crafted PDF can cause long processing runtimes when such a stream is accessed. Upgrade to pypdf 6.12.2 or later. The source gives no workaround the reader can apply directly other than the upstream patch.

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
5.1 Medium 4.0 CVSS:4.0/AV:L/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 0.0017, the 5th 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, 15:03 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.