MEDIUM 5.3 npm
markdown-it is has a Regular Expression Denial of Service (ReDoS)
GHSA-38c4-r59v-3vqw · CVE-2026-2327
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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.
References
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-2327
- WEB https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26
- WEB https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917
- PACKAGE https://github.com/markdown-it/markdown-it
- WEB https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs#L33
- WEB https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750
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