CVE-2026-121438Mistune before 3.3.3 Denial of Service via Balanced Bracket Link Parsing

Beschreibung

Mistune before 3.3.3 contains a denial of service vulnerability in InlineParser.parse_link that allows attackers to cause quadratic CPU growth by supplying balanced nested brackets. Attackers can submit crafted Markdown with thousands of nested bracket pairs not forming a valid link, triggering repeated _contains_nested_link scans that exhaust CPU in parsing applications.

Daten: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Wiedergegeben wie in der Quelle, auf Englisch.

Betroffene Produkte und Versionen

Referenzen und Patches

• GitHub Security Advisory (GHSA-47p6-w2rc-5qf7) vendor-advisory
• Patch Commit patch
• VulnCheck Advisory: Mistune before 3.3.3 Denial of Service via Balanced Bracket Link Parsing third-party-advisory