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CVE-2026-86430

8.7 high SSVC exploitation: none Analyzed
NVD · CVE.org

league/commonmark versions before 2.9.1 contain multiple denial of service vulnerabilities in fenced code block detection, reference link label lookup, and emphasis delimiter processing that perform super-linear work on crafted input. Attackers can submit specially crafted Markdown with long backtick runs, nested brackets, or delimiter sequences to consume disproportionate CPU time and prevent legitimate requests from completing.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.7 · thephpleagueNVD modified 2026-10-08 16:17

Affected (CPE criteria) 1

  • cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:*

References 2