GHSA-55h5-xmcq-c37v

pypdf: Possible long runtimes for repeated malformed cross-reference entries

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-59937

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.14.0	6.14.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams. ### Patches This has been fixed in [pypdf==6.14.0](https://github.com/py-pdf/pypdf/releases/tag/6.14.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3887](https://github.com/py-pdf/pypdf/pull/3887).

References

External links from the advisory. They lead to third-party sites.

https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v web
https://nvd.nist.gov/vuln/detail/CVE-2026-59937 advisory
https://github.com/py-pdf/pypdf/pull/3887 web
https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.14.0 web