py-pdf/pypdf · Security
pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
- GHSA ID
- GHSA-2rw7-x74f-jg35
- CVE ID
- CVE-2026-27628
- Severity
- low
- Published
- Updated
- CVSS v4
- 1.2 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file.
Patches
This has been fixed in pypdf==6.7.2.
Workarounds
If users cannot upgrade yet, consider applying the changes from PR #3655.
CWEs
- CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')