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CVE-2026-111759

7.5 · HIGH

markdown-it is a Markdown parser.

Published Oct 19, 2026CWE-400EPSS 0.59%

Overview

CVE-2026-111759 is a high-severity vulnerability. It was published on October 19, 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

markdown-it is a Markdown parser. Prior to 14.3.2 and 15.0.2, when typographer: true is enabled, specially crafted Markdown can cause quadratic processing time in the smartquotes rule, potentially leading to denial of service in applications processing untrusted input. Many opening double quotes followed by unmatched closing single quotes cause repeated scans of the entire opener stack. The same issue occurs with the quote types reversed. The default configuration (typographer: false) is not affected, but this option is enabled with high probability. This issue is fixed in versions 14.3.2 and 15.0.2.

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/markdown-it/markdown-it/commit/1b379c1b6d0522421bd1a51b77337c79af2c8670GitHubgithub.com/markdown-it/markdown-it/commit/cf27366035edf9196667110c47d9d67b030a4152GitHubgithub.com/markdown-it/markdown-it/commit/daf5a3c32303e5d9de01b12eeb725fb5990b8162GitHubgithub.com/markdown-it/markdown-it/releases/tag/14.3.2GitHubgithub.com/markdown-it/markdown-it/releases/tag/15.0.2GitHubgithub.com/markdown-it/markdown-it/security/advisories/GHSA-r7fv-28h4-cvq7GitHubgithub.com/markdown-it/markdown-it/security/advisories/GHSA-r7fv-28h4-cvq7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-111759?

CVE-2026-111759 is a high-severity vulnerability. It was published on October 19, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-111759?

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-2026-111759?

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-2026-111759?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-111759 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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