py-pdf/pypdf · Security
pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream
- GHSA ID
- GHSA-87mj-5ggw-8qc3
- CVE ID
- CVE-2026-33699
- Severity
- medium
- Published
- Updated
- CVSS v4
- 4.6 · 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
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.
CWEs
- CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')