League Commonmark Before 2.9.1 Denial Of Service Via Parsing

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League Commonmark Before 2.9.1 Denial Of Service Via Parsing

www.vulncheck.com • September 8, 2026

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Multiple Commonmark Denial of Service Vulnerabilities Disclosed A series of denial of service vulnerabilities affecting various versions of Commonmark have been disclosed. The vulnerabilities impact versions prior to 2.9.1, 2.8.4, and 2.10.0, as well as 2.0.0 through 2.8.3. Attack vectors include issues with smartpunct, attributes, footnotes, and slug collisions. The vulnerabilities could allow attackers to disrupt service availability. Affected systems include those utilizing Commonmark for parsing markdown content. Currently, there are no reports of active exploitation in the wild. Security professionals are advised to prioritize patching these vulnerabilities based on their threat landscape. The vulnerabilities have been documented in multiple advisories published on the same day. 45

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