GitHub Advisoryadvisory · PyPI

GHSA-23w6-3w8w-8484 pypdf: Possible long runtimes/large memory usage when retrieving outlines

MEDIUM Published 2026-09-01 Modified 2026-09-01 Official page ↗
Aliases
CVE-2026-84310
Ecosystem
PyPI
Packages
pypdf
Severity
Moderate
CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weaknesses
CWE-405, CWE-834
Reviewed
2026-09-01

Affected packages

• PyPI pypdf: < 6.16.1 → fixed in 6.16.1

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires accessing the outlines of a document with either lots of entries or nested outlines with long re-used nesting paths. Patches This has been fixed in pypdf==6.16.1. Workarounds If you cannot upgrade yet, consider applying the changes from PR #3966.

Related

Alias · CVE (1)

  • CVE-2026-84310 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (2)

  • CWE-405 Asymmetric Resource Consumption (Amplification) weakness
  • CWE-834 Excessive Iteration weakness

References