py-pdf/pypdf · Security
pypdf has a possible infinite loop when processing TreeObject
- GHSA ID
- GHSA-996q-pr4m-cvgq
- CVE ID
- CVE-2026-27024
- 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 accessing the children of a TreeObject, for example as part of outlines.
Patches
This has been fixed in pypdf==6.7.1.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3645.
CWEs
- CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-996q-pr4m-cvgq ↗
- https://github.com/py-pdf/pypdf/pull/3645 ↗
- https://github.com/py-pdf/pypdf/commit/bd2f6d052fe5941e85e37082c2a43453d48d1295 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.7.1 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-27024 ↗
- https://github.com/advisories/GHSA-996q-pr4m-cvgq ↗