Description
Versions of the package markdown-it from 13.0.0 and before 14.1.1 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of the regex /\*+$/ in the linkify function. An attacker can supply a long sequence of * characters followed by a non-matching character, which triggers excessive backtracking and may lead to a denial-of-service condition.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | markdown-it | >= 13.0.0, < 14.1.1 |
References
- https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917Vendor Advisory
- https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs%23L33Broken Link
- https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26Patch, Product
- https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750Third Party Advisory
- https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917Vendor Advisory
- https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750Third Party Advisory
Timeline
- Published
- Feb 12, 2026
- Last modified
- Jun 17, 2026
- NVD status
- Analyzed