GitHub Advisoryadvisory · PyPI

GHSA-fp3h-c4fm-7vvf pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)

HIGH Published 2026-10-01 Modified 2026-10-01 Official page ↗
Aliases
CVE-2026-102995
Ecosystem
PyPI
Packages
pypdf
Severity
High
CVSS vector
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
Weaknesses
CWE-400
Reviewed
2026-10-01

Affected packages

• PyPI pypdf: < 6.18.1 → fixed in 6.18.1

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the `/ToUnicode` entry of a font with unusually large values, for example during text extraction. Patches This has been fixed in pypdf==6.18.1. Workarounds If you cannot upgrade yet, consider applying the changes from PR #4071.

Related

Alias · CVE (1)

  • CVE-2026-102995 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References