league/commonmark vulnerabilities

Browse known CVEs and advisories by package and ecosystem. Severity tells you the worst case. What determines real risk is whether the vulnerable code actually runs in your applications.

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CVE-IDSeverityPackage summary
GHSA-8RR7-CVQ3-GMFHHighleague/commonmark: league/commonmark: Denial of service via distinctly-named attributes in the Attributes extensionGHSA-JJV6-8J6V-6J52Highleague/commonmark: league/commonmark: Denial of service in the SmartPunct and Attributes extensionsGHSA-F8FG-PG57-V4J8Highleague/commonmark: league/commonmark XSS: `on*` event-handler filter in `AttributesExtension` bypassed with a U+000C form feedGHSA-J8PM-GJ4C-RQ4XHighleague/commonmark: league/commonmark: Denial of service via crafted code fences, reference links, and emphasis delimitersGHSA-MJ63-M3RC-8PPRMediumleague/commonmark: league/commonmark: Denial of service via deeply nested XML outputGHSA-MH25-X5HQ-WRQPHighleague/commonmark: league/commonmark: Denial of service via colliding heading slugsGHSA-JFM3-95JQ-Q3RFHighleague/commonmark: league/commonmark: Denial of service via duplicate footnote definitionsGHSA-G2GP-3WWQ-F4PHHighleague/commonmark: league/commonmark: Denial of service via adjacent inline attribute blocksCVE-2026-71488Highleague/commonmark: league/commonmark: Quadratic-time denial of service when parsing crafted MarkdownCVE-2026-71478Mediumleague/commonmark: league/commonmark: AttributesExtension href/src unsafe-link filter bypass via embedded control bytesCVE-2026-33347Mediumleague/commonmark: league/commonmark has an embed extension allowed_domains bypassCVE-2026-30838Mediumleague/commonmark: CommonMark has DisallowedRawHtml extension bypass via whitespace in HTML tag namesCVE-2025-46734Mediumleague/commonmark: league/commonmark contains a XSS vulnerability in Attributes extensionGHSA-C2PC-G5QF-RFRFHighleague/commonmark: league/commonmark's quadratic complexity bugs may lead to a denial of serviceCVE-2018-20583Mediumleague/commonmark: PHP League CommonMark vulnerable to Cross-Site Scripting (XSS)CVE-2019-10010Mediumleague/commonmark: Moderate severity vulnerability that affects league/commonmark

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