CVE-2026-22691

Description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-4f6g-68pf-7vhv

https://github.com/py-pdf/pypdf/releases/tag/6.6.0

https://github.com/py-pdf/pypdf/pull/3594

https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS