GHSA-6vvc-x485-93v7

pypdf: Possible long runtimes/large memory usage when retrieving form fields

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-113789

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 and/or long runtimes. This requires retrieving the form fields of a document. ### 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 [#4219](https://github.com/py-pdf/pypdf/pull/4219).

References

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

https://github.com/py-pdf/pypdf/security/advisories/GHSA-6vvc-x485-93v7 web
https://nvd.nist.gov/vuln/detail/CVE-2026-113789 advisory
https://github.com/py-pdf/pypdf/pull/4219 web
https://github.com/py-pdf/pypdf/commit/5ef728f0e16d225c853e89f861ba0a67402fe3f2 web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.21.0 web