py-pdf/pypdf · Security
pypdf: Possible infinite loop when processing threads/articles in writer
- GHSA ID
- GHSA-g9xf-7f8q-9mcj
- CVE ID
- CVE-2026-54651
- 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 threads/articles into a writer.
Patches
This has been fixed in pypdf==6.13.1.
Workarounds
If users cannot upgrade yet, consider applying the changes from PR #3839.
CWEs
- CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')