pypdf: Possible infinite loop when processing outlines/bookmarks in writer
### Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer. ### Patches This has been fixed in [pypdf==6.13.0](https://github.com/py-pdf/pypdf/releases/tag/6.13.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3830](https://github.com/py-pdf/pypdf/pull/3830).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-54531US | medium5.5 | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.13.0, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires mer… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/advisories/GHSA-m2v9-299j-rv96ADVISORY
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/pull/3830WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.13.0WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-m2v9-299j-rv96WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-54531ADVISORY
- https://pypi.org/project/pypdfPACKAGE
scry
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