High severity7.5NVD Advisory· Published Sep 7, 2026· Updated Oct 8, 2026
CVE-2026-86428
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
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Affected products
2cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:*range: >=1.5.0,<2.10.0
- (no CPE)range: 1.5.0 <= x < 2.10.0
Patches
Vulnerability mechanics
References
2- github.com/thephpleague/commonmark/security/advisories/GHSA-8rr7-cvq3-gmfhnvdMitigationVendor Advisory
- www.vulncheck.com/advisories/commonmark-1.5.0-before-2.10.0-denial-of-service-via-attributesnvdThird Party Advisory
News mentions
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