py-pdf/pypdf · Security
pypdf: Possible infinite loop when processing outlines/bookmarks in writer
- GHSA ID
- GHSA-m2v9-299j-rv96
- CVE ID
- CVE-2026-54531
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6.9 · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer.
Patches
This has been fixed in pypdf==6.13.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3830.
CWEs
- CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')