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CVE-2026-22690

5.3 · MEDIUM

pypdf is a free and open-source pure-python PDF library.

Published Jan 10, 2026CWE-400EPSS 0.43%

Overview

CVE-2026-22690 is a medium-severity vulnerability. It was published on January 10, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45GitHubgithub.com/py-pdf/pypdf/pull/3594GitHubgithub.com/py-pdf/pypdf/releases/tag/6.6.0GitHubgithub.com/py-pdf/pypdf/security/advisories/GHSA-4xc4-762w-m6cg

How CyberStrike helps

Frequently asked questions

What is CVE-2026-22690?

CVE-2026-22690 is a medium-severity vulnerability. It was published on January 10, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-22690?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-22690?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-22690?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-22690 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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