MEDIUM
GHSA-fc8x-2rww-xw9m
pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace
Quick fix
GHSA-fc8x-2rww-xw9m — pypdf: upgrade to the fixed version with the command below.
pip install --upgrade 'pypdf>=6.15.0'Details
### 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).
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- 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]