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CVE-2026-22690

Published: Jan 10, 2026

Modified: Jan 12, 2026

PUBLISHED

Description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for missing /Root object with large /Size values. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.

Vendor	Product	Versions
py-pdf	pypdf	affected `< 6.6.0`

Weaknesses (CWE)

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-4xc4-762w-m6cg

x_refsource_CONFIRM

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

x_refsource_MISC

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

x_refsource_MISC

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

x_refsource_MISC

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