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Advisory record · GHSA-fc8x-2rww-xw9m

pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace

CVSS 6.9 MediumEPSS 0.0052 · 45th percentile

Published by the GitHub Advisory Database at 2 Sept 2026, 14:38 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pypdfPyPI<6.15.06.15.0
Identifiers
GHSA-fc8x-2rww-xw9m · CVE-2026-82398 · PYSEC-2026-3912
Weakness (CWE)
CWE-407
Tags
Published
2 Sept 2026
Updated
10 Sept 2026

Machine-written summary

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

The pypdf package before 6.15.0 is vulnerable to inefficient handling of non-whitespace input in its read_until_whitespace function. An attacker can craft a PDF that causes very long processing times, and the trigger is a call to that function with input containing no whitespace for a long stretch. Upgrade to pypdf 6.15.0 or later. The source gives few details about how the PDF reaches that code path.

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 0.0052, the 45th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Aug 2026, 22:17 UTC Confirmed by NVD
  2. 31 Oct 2026, 14:10 UTC First seen by agentprime
  3. 31 Oct 2026, 14:10 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.