CVE-2026-111758
highmarkdown-it is a Markdown parser.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/markdown-it/markdown-it/commit/48fbc465812c440020c663f040ab22deaf8f1eca security-advisories@github.com
- https://github.com/markdown-it/markdown-it/commit/d99f48839d37af6fd8a2617516c43dab90755503 security-advisories@github.com
- https://github.com/markdown-it/markdown-it/releases/tag/14.3.3 security-advisories@github.com
- https://github.com/markdown-it/markdown-it/releases/tag/15.0.3 security-advisories@github.com
- https://github.com/markdown-it/markdown-it/security/advisories/GHSA-gfr2-rv44-r23c security-advisories@github.com
- https://github.com/markdown-it/markdown-it/security/advisories/GHSA-gfr2-rv44-r23c 134c704f-9b21-4f2e-91b3-4a467353bcc0