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CVE-2026-86428

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

commonmark versions from 1.5.0 before 2.10.0 contain a denial of service vulnerability in the AttributesExtension when processing distinctly-named attributes. Attackers can submit Markdown with numerous distinct attribute names to cause quadratic-time attribute merging and filtering, consuming disproportionate CPU resources and preventing 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