Vulnerability in Markdown-It Project
CVE-2026-2327
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.007 (50.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.000
Affected products
- Markdown-It Project
- Markdown-It — versions 13.0.0
Weakness classification (CWE)
References
- security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750 (Third Party Advisory)
- gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917 (Vendor Advisory)
- github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs#L33 (Broken Link)
- github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012e… (Product, Patch)
Frequently asked questions
- What is CVE-2026-2327?
- CVE-2026-2327 is a medium-severity vulnerability in Markdown-It Project, classified under Inefficient Regular Expression Complexity. CVSS score: 5.3/10. Published 2026-02-12.
- How severe is CVE-2026-2327?
- Medium severity. CVSS v3 base score is 5.3 out of 10.