py-pdf/pypdf · Security
pypdf: Possible infinite loop when removing tree items
- GHSA ID
- GHSA-9mx8-4j7g-633p
- CVE ID
- CVE-2026-113793
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/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 removing an object from a tree, for example an outline item.
Patches
This has been fixed in pypdf==6.20.1.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #4188.
CWEs
- CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mx8-4j7g-633p ↗
- https://github.com/py-pdf/pypdf/pull/4188 ↗
- https://github.com/py-pdf/pypdf/commit/c9c35b4471c2eb5fe078094f6c816e69d4ed25a0 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.20.1 ↗
- https://github.com/advisories/GHSA-9mx8-4j7g-633p ↗