MEDIUM 6.9 NVD
CVE-2026-84309
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_str
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.
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
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-09-01 via NVD.
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