medium5.3
CVE-2026-2327
markdown-it is has a Regular Expression Denial of Service (ReDoS)
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | markdown-it | >= 13.0.0, < 14.1.1 | 14.1.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Markdown-It Project | Markdown-It | from 13.0.0 before 14.1.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917
- https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs%23L33
- https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26
- https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750
- https://github.com/advisories/GHSA-38c4-r59v-3vqw
- https://nvd.nist.gov/vuln/detail/CVE-2026-2327
- https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs#L33