Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.0, an attacker can craft a PDF whose cyclic tree structure causes pypdf/generic/_data_structures.py TreeObject.insert_child to follow /Next links indefinitely when a writing code path inserts a child, producing an infinite loop. This issue is fixed in version 6.16.0.
Related Weaknesses (CWE)
References
- https://github.com/py-pdf/pypdf/commit/c9ba557d565d57c53a0b3a0be06c0a4c29b0559b
- https://github.com/py-pdf/pypdf/pull/3964
- https://github.com/py-pdf/pypdf/releases/tag/6.16.0
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-jp53-mhqp-8xcg
FAQ
What is CVE-2026-84309?
CVE-2026-84309 is a documented vulnerability. pypdf is a free and open-source pure-python PDF library. Prior to 6.16.0, an attacker can craft a PDF whose cyclic tree structure causes pypdf/generic/_data_structures.py TreeObject.insert_child to fo...
How severe is CVE-2026-84309?
CVSS scoring is not yet available for CVE-2026-84309. Check NVD for updates.
Is there a patch for CVE-2026-84309?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.