MEDIUM GitHub
CVE-2026-113792
pypdf: Possible infinite loop in PdfWriter.find_outline_item
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires calling `find_outline_item` on a `PdfWriter`.
### Patches
This has been fixed in [pypdf==6.20.1](https://github.com/py-pdf/pypdf/releases/tag/6.20.1).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#4188](https://github.com/py-pdf/pypdf/pull/4188).
Affected Products
- pip/pypdf < 6.20.1
References
- https://github.com/advisories/GHSA-qfv9-64jg-mh7p
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-qfv9-64jg-mh7p
- https://github.com/py-pdf/pypdf/pull/4188
- https://github.com/py-pdf/pypdf/commit/c9c35b4471c2eb5fe078094f6c816e69d4ed25a0
This medium severity vulnerability was published on 2026-10-21 via GitHub. Affected: pip/pypdf < 6.20.1.
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