HIGH8.7
PYSEC-2026-4159
pypdf: Possible long runtimes with large amount of embedded files
Quick fix
PYSEC-2026-4159 — pypdf: upgrade to the fixed version with the command below.
pip install --upgrade 'pypdf>=6.19.0'Details
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing the embedded files through the dictionary-based API.
### Patches
This has been fixed in [pypdf==6.19.0](https://github.com/py-pdf/pypdf/releases/tag/6.19.0).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#4081](https://github.com/py-pdf/pypdf/pull/4081).
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-v247-6f48-mgcj[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-102999[ADVISORY]
- https://github.com/py-pdf/pypdf/pull/4081[WEB]
- https://github.com/py-pdf/pypdf/commit/6b10556d13609a68f9ed18bb29fdd8bba88eb2c3[WEB]
- https://github.com/py-pdf/pypdf[PACKAGE]
- https://github.com/py-pdf/pypdf/releases/tag/6.19.0[WEB]
- https://pypi.org/project/pypdf[PACKAGE]
- https://github.com/advisories/GHSA-v247-6f48-mgcj[ADVISORY]