GitHub Advisoryadvisory · PyPI

GHSA-87mj-5ggw-8qc3 pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream

MEDIUM Published 2026-03-25 Modified 2026-03-27 Official page ↗
Aliases
CVE-2026-33699
Ecosystem
PyPI
Packages
pypdf
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
Weaknesses
CWE-835
Reviewed
2026-03-25

Affected packages

• PyPI pypdf: < 6.9.2 → fixed in 6.9.2

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. Patches This has been fixed in pypdf==6.9.2. Workarounds If users cannot upgrade yet, consider applying the changes from PR #3693.

Related

Alias · CVE (1)

  • CVE-2026-33699 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

References