CVE-2026-102994

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.0, a crafted PDF containing indirect-object identifiers or generation-number tokens that continue for a long time without whitespace can cause pypdf/_reader.py and pypdf/generic/_base.py to scan excessive input through read_until_whitespace, resulting in long runtimes and application unavailability. This issue is fixed in version 6.18.0.

References

• https://github.com/py-pdf/pypdf/commit/82501d2993c6387833c4949d205caeb188f8bb9e
• https://github.com/py-pdf/pypdf/pull/4055
• https://github.com/py-pdf/pypdf/releases/tag/6.18.0
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-5jq2-8x83-x246