Security Advisory

CVE-2026-22690

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-01-10 04:41:20

Last updated 2026-01-12 17:07:00

Assigner GitHub_M

State 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.

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