Vulnerability Details 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. 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 20.2%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-86428
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cpe:2.3:a:thephpleague:commonmark:1.5.0
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cpe:2.3:a:thephpleague:commonmark:1.5.1
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cpe:2.3:a:thephpleague:commonmark:1.5.2
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cpe:2.3:a:thephpleague:commonmark:1.5.3
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cpe:2.3:a:thephpleague:commonmark:1.5.4
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cpe:2.3:a:thephpleague:commonmark:1.5.5
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cpe:2.3:a:thephpleague:commonmark:1.5.6
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cpe:2.3:a:thephpleague:commonmark:1.5.7
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cpe:2.3:a:thephpleague:commonmark:1.5.8
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cpe:2.3:a:thephpleague:commonmark:1.6.0
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cpe:2.3:a:thephpleague:commonmark:1.6.1
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cpe:2.3:a:thephpleague:commonmark:1.6.2
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cpe:2.3:a:thephpleague:commonmark:1.6.3
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cpe:2.3:a:thephpleague:commonmark:1.6.4
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cpe:2.3:a:thephpleague:commonmark:1.6.5
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cpe:2.3:a:thephpleague:commonmark:1.6.6
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cpe:2.3:a:thephpleague:commonmark:1.6.7
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cpe:2.3:a:thephpleague:commonmark:2.0.0
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cpe:2.3:a:thephpleague:commonmark:2.0.1
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cpe:2.3:a:thephpleague:commonmark:2.0.2
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cpe:2.3:a:thephpleague:commonmark:2.0.3
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cpe:2.3:a:thephpleague:commonmark:2.0.4
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cpe:2.3:a:thephpleague:commonmark:2.1.0
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cpe:2.3:a:thephpleague:commonmark:2.1.1
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cpe:2.3:a:thephpleague:commonmark:2.1.2
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cpe:2.3:a:thephpleague:commonmark:2.1.3
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cpe:2.3:a:thephpleague:commonmark:2.2.0
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cpe:2.3:a:thephpleague:commonmark:2.2.1
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cpe:2.3:a:thephpleague:commonmark:2.2.2
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cpe:2.3:a:thephpleague:commonmark:2.2.3
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cpe:2.3:a:thephpleague:commonmark:2.2.4
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cpe:2.3:a:thephpleague:commonmark:2.2.5
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cpe:2.3:a:thephpleague:commonmark:2.3.0
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cpe:2.3:a:thephpleague:commonmark:2.3.1
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cpe:2.3:a:thephpleague:commonmark:2.3.2
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cpe:2.3:a:thephpleague:commonmark:2.3.3
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cpe:2.3:a:thephpleague:commonmark:2.3.4
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cpe:2.3:a:thephpleague:commonmark:2.3.5
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cpe:2.3:a:thephpleague:commonmark:2.3.6
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cpe:2.3:a:thephpleague:commonmark:2.3.7
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cpe:2.3:a:thephpleague:commonmark:2.3.8
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cpe:2.3:a:thephpleague:commonmark:2.3.9
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cpe:2.3:a:thephpleague:commonmark:2.4.0
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cpe:2.3:a:thephpleague:commonmark:2.4.1
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cpe:2.3:a:thephpleague:commonmark:2.4.2
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cpe:2.3:a:thephpleague:commonmark:2.4.3
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cpe:2.3:a:thephpleague:commonmark:2.4.4
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cpe:2.3:a:thephpleague:commonmark:2.5.0
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cpe:2.3:a:thephpleague:commonmark:2.5.1
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cpe:2.3:a:thephpleague:commonmark:2.5.2
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cpe:2.3:a:thephpleague:commonmark:2.5.3
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cpe:2.3:a:thephpleague:commonmark:2.6.0
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cpe:2.3:a:thephpleague:commonmark:2.6.1
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cpe:2.3:a:thephpleague:commonmark:2.6.2
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cpe:2.3:a:thephpleague:commonmark:2.7.0
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cpe:2.3:a:thephpleague:commonmark:2.7.1
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cpe:2.3:a:thephpleague:commonmark:2.8.0
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cpe:2.3:a:thephpleague:commonmark:2.8.1
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cpe:2.3:a:thephpleague:commonmark:2.8.2
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cpe:2.3:a:thephpleague:commonmark:2.8.3
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cpe:2.3:a:thephpleague:commonmark:2.9.0
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cpe:2.3:a:thephpleague:commonmark:2.9.1
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cpe:2.3:a:thephpleague:commonmark:2.9.2