High severity7.5NVD Advisory· Published Sep 7, 2026

CVE-2026-86428

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Thephpleague/Commonmarkllm-fuzzy
Range: from 1.5.0 before 2.10.0

Patches

Vulnerability mechanics

References

github.com/thephpleague/commonmark/security/advisories/GHSA-8rr7-cvq3-gmfhnvd
www.vulncheck.com/advisories/commonmark-1.5.0-before-2.10.0-denial-of-service-via-attributesnvd

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