MediumGHSA-38c4-r59v-3vqwCVE-2026-2327

markdown-it is has a Regular Expression Denial of Service (ReDoS)

Published 12 Feb 2026 · Updated 10 Sept 2026

Affected package

markdown-itnpm
Affected
>=13.0.0 <14.1.1
Fixed in
14.1.1
Update to the fixed version for your release line, for example:npm install markdown-it@14.1.1

Details

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.

Is GHSA-38c4-r59v-3vqw in any of your client repos?

Checking one package by hand is fine. Checking it across forty client projects is not. NPMscan reads the lockfiles in every GitHub repo you pick, finds each project with an affected markdown-it, and gives you the command that fixes it.

Scan a project free, no signupOr connect GitHub to scan every repo

References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.