py-pdf/pypdf · Security
pypdf: Possible infinite loop for TreeObject.insert_child
- GHSA ID
- GHSA-jp53-mhqp-8xcg
- CVE ID
- CVE-2026-84309
- 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 a (usually writing) code path where TreeObject.insert_child is involved.
Patches
This has been fixed in pypdf==6.16.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3964.
CWEs
- CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-jp53-mhqp-8xcg ↗
- https://github.com/py-pdf/pypdf/pull/3964 ↗
- https://github.com/py-pdf/pypdf/commit/c9ba557d565d57c53a0b3a0be06c0a4c29b0559b ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.16.0 ↗
- https://github.com/advisories/GHSA-jp53-mhqp-8xcg ↗