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CVE-2026-111758

7.5 · HIGH

markdown-it is a Markdown parser.

Published Oct 20, 2026CWE-400EPSS 0.55%

Overview

CVE-2026-111758 is a high-severity vulnerability. It was published on October 20, 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. From versions 14.1.0 to before 14.3.3, and 15.0.0 to before 15.0.3, a link reference definition whose label or title is never closed is O(n²) with default options. Continuation lines are pulled lazily with str += lineContent in src/rules_block/reference.ts, and the subsequent charCodeAt and slice calls flatten the V8 cons-string, copying everything collected so far; this runs before the rule decides the definition is invalid. No options are required to trigger it. This issue has been patched 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/48fbc465812c440020c663f040ab22deaf8f1ecaGitHubgithub.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-gfr2-rv44-r23cGitHubgithub.com/markdown-it/markdown-it/security/advisories/GHSA-gfr2-rv44-r23c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-111758?

CVE-2026-111758 is a high-severity vulnerability. It was published on October 20, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-111758?

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-2026-111758?

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-2026-111758?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-111758 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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