GitHub Advisoryadvisory · PyPI

GHSA-w23x-9jrw-r45c pypdf: Possible large memory usage when retrieving alphabetical page labels

HIGH Published 2026-10-01 Modified 2026-10-01 Official page ↗
Aliases
CVE-2026-103000
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: < 6.19.0 → fixed in 6.19.0

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires accessing the page labels of a document with large alphabetical labels. Patches This has been fixed in pypdf==6.19.0. Workarounds If you cannot upgrade yet, consider applying the changes from PR #4096.

Related

Alias · CVE (1)

  • CVE-2026-103000 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References