HIGH 8.7 NVD
CVE-2026-86428
commonmark versions from 1.5.0 before 2.10.0 contain a denial of service vulnerability in the AttributesExtension when processing distinctly-named attributes. A
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.
References
- https://github.com/thephpleague/commonmark/security/advisories/GHSA-8rr7-cvq3-gmfh
- https://www.vulncheck.com/advisories/commonmark-1.5.0-before-2.10.0-denial-of-service-via-
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-09-07 via NVD.
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