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CVE-2026-59922

7.5 · HIGH

Mistune is a Python Markdown parser with renderers and plugins.

Published Jul 8, 2026CWE-407EPSS 0.64%

Overview

CVE-2026-59922 is a high-severity vulnerability. It was published on July 8, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.

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/lepture/mistune/commit/96d0f57f8fe9eeb06bb4cff521962a27d7c402e7GitHubgithub.com/lepture/mistune/releases/tag/v3.3.0GitHubgithub.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmqGitHubgithub.com/lepture/mistune/security/advisories/GHSA-c8j7-8cv4-2xmq

How CyberStrike helps

Frequently asked questions

What is CVE-2026-59922?

CVE-2026-59922 is a high-severity vulnerability. It was published on July 8, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-59922?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-59922?

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-2026-59922?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-59922 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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