GHSA-f54x-cmq8-qg57

pypdf: Possible large memory usage when parsing arrays and dictionaries

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-113790

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.21.0	6.21.0

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 large memory usage. This requires parsing arrays and/or dictionaries with lots of elements. ### Patches This has been fixed in [pypdf==6.21.0](https://github.com/py-pdf/pypdf/releases/tag/6.21.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4218](https://github.com/py-pdf/pypdf/pull/4218).

References

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

https://github.com/py-pdf/pypdf/security/advisories/GHSA-f54x-cmq8-qg57 web
https://nvd.nist.gov/vuln/detail/CVE-2026-113790 advisory
https://github.com/py-pdf/pypdf/pull/4218 web
https://github.com/py-pdf/pypdf/commit/18bd2981a74479483a0b9507602c58a63d6c9b12 web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.21.0 web