Regular Expression Denial of Service in markdown

Description

All versions of markdown are vulnerable to Regular Expression Denial of Service (ReDoS). The markdown.toHTML() function has significantly degraded performance when parsing long strings containing underscores. This may lead to Denial of Service if the parser accepts user input.

Recommendation

No fix is available yet. Followings are affected versions:

• >= 0.0.0

References

• GHSA-wx77-rp39-c6vg
• www.npmjs.com
• CWE-400

Related Issues

• mongosh vulnerable to local privilege escalation - CVE-2025-1756
• Elliptic's EDDSA missing signature length check - CVE-2024-42459
• Nuxt Devtools has a Path Traversal: '../filedir - CVE-2024-23657
• Incorrect default cookie name and recommendation - Vulnerability

Tags:

npm

markdown