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CVE-2026-111766

3.7 · LOW

markdown-it is a Markdown parser.

Published Oct 19, 2026CWE-400EPSS 0.43%

Overview

CVE-2026-111766 is a low-severity vulnerability. It was published on October 19, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. 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 14.3.3 and 15.0.3, when the html option or commonmark preset is enabled and the constructs occur inside a paragraph, attacker-controlled Markdown containing repeated unterminated inline HTML comments, processing instructions, declarations, or CDATA sections reaches src/rules_inline/html_inline.ts. Its HTML_TAG_RE match searches the remaining suffix for the appropriate terminator; when no terminator is present, parsing advances to the next opener and repeats the match over overlapping input, causing quadratic processing and denial of service through event-loop blocking or an unresponsive browser main thread. HTML blocks and the default HTML-disabled configuration are not affected by these payloads. This issue is fixed in versions 14.3.3 and 15.0.3.

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/928bc8c11ded60181c0e7fc5aa954eec582e8e79GitHubgithub.com/markdown-it/markdown-it/commit/d99f48839d37af6fd8a2617516c43dab90755503GitHubgithub.com/markdown-it/markdown-it/releases/tag/14.3.3GitHubgithub.com/markdown-it/markdown-it/releases/tag/15.0.3GitHubgithub.com/markdown-it/markdown-it/security/advisories/GHSA-vfgh-jcmw-g37q

How CyberStrike helps

Frequently asked questions

What is CVE-2026-111766?

CVE-2026-111766 is a low-severity vulnerability. It was published on October 19, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2026-111766?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-111766?

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-2026-111766?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-111766 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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