GHSA-fc8x-2rww-xw9m

pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-82398

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.15.0	6.15.0

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 a call to `read_until_whitespace` with an input which does not have whitespace for a long time. ### Patches This has been fixed in [pypdf==6.15.0](https://github.com/py-pdf/pypdf/releases/tag/6.15.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#3947](https://github.com/py-pdf/pypdf/pull/3947).

References

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

https://github.com/py-pdf/pypdf/security/advisories/GHSA-fc8x-2rww-xw9m web
https://nvd.nist.gov/vuln/detail/CVE-2026-82398 advisory
https://github.com/py-pdf/pypdf/pull/3947 web
https://github.com/py-pdf/pypdf/commit/4959848e057e37c218dccad7465259210923faaa web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.15.0 web