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Advisory record · GHSA-v247-6f48-mgcj

pypdf: Possible long runtimes with large amount of embedded files

CVSS 8.7 HighEPSS 0.0035 · 28th percentile

Published by the GitHub Advisory Database at 1 Oct 2026, 15:07 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pypdfPyPI<6.19.06.19.0
Identifiers
GHSA-v247-6f48-mgcj · CVE-2026-102999 · PYSEC-2026-4159
Weakness (CWE)
CWE-400 · CWE-407
Tags
Published
1 Oct 2026
Updated
1 Oct 2026

Machine-written summary

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

pypdf versions before 6.19.0 are vulnerable to long runtimes when processing a crafted PDF with a large number of embedded files. The attack requires the application to access those embedded files through the dictionary-based API, and an attacker supplying the PDF can cause the processing to run for an extended time. Upgrade to pypdf 6.19.0 or later. The source gives few details on the workaround, so no separate workaround is described.

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
8.7 High 4.0 CVSS:4.0/AV:N/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 0.0035, the 28th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 30 Sept 2026, 21:17 UTC Confirmed by NVD
  2. 31 Oct 2026, 14:09 UTC First seen by agentprime
  3. 31 Oct 2026, 14:09 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.