pypdf: Possible infinite loop for TreeObject.insert_child
### 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](https://github.com/py-pdf/pypdf/releases/tag/6.16.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3964](https://github.com/py-pdf/pypdf/pull/3964).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-84309US | medium5.5 | — | ||
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 TreeObjec… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/advisories/GHSA-jp53-mhqp-8xcgADVISORY
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/c9ba557d565d57c53a0b3a0be06c0a4c29b0559bWEB
- https://github.com/py-pdf/pypdf/pull/3964WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.16.0WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-jp53-mhqp-8xcgWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-84309ADVISORY
- https://pypi.org/project/pypdfPACKAGE
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