GHSA-gmh7-3g9r-mjh5

pypdf: Possible long runtimes for large xref table header limits

Source: GitHub Advisory Database (reviewed) High CVE-2026-115580

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.21.2	6.21.2

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 opening a file with large/wrong upper limits in the xref table. ### Patches This has been fixed in [pypdf==6.21.2](https://github.com/py-pdf/pypdf/releases/tag/6.21.2). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4239](https://github.com/py-pdf/pypdf/pull/4239).

References

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

https://github.com/py-pdf/pypdf/security/advisories/GHSA-gmh7-3g9r-mjh5 web
https://github.com/py-pdf/pypdf/pull/4239 web
https://github.com/py-pdf/pypdf/commit/a3061e34b169d34478d520f5f049c53cfb1482b2 web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.21.2 web