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Advisory record · GHSA-fp3h-c4fm-7vvf

pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)

CVSS 8.7 HighEPSS 0.0034 · 27th percentile

Published by the GitHub Advisory Database at 1 Oct 2026, 15:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pypdfPyPI<6.18.16.18.1
Identifiers
GHSA-fp3h-c4fm-7vvf · CVE-2026-102995 · PYSEC-2026-4154
Weakness (CWE)
CWE-400
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 6.18.1 are vulnerable to excessive memory consumption when parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction. An attacker who supplies a crafted PDF can cause large memory use when it is processed. Upgrade to pypdf 6.18.1 or later. The source does not describe a workaround beyond applying the upstream patch.

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 0.0034, the 27th 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.