{"id":"CVE-2026-86428","revision":"5285163c8329401e9994f134ccb7a755","records":[{"revision":"5285163c8329401e9994f134ccb7a755","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-86428","aliases":[],"title":"commonmark 1.5.0 before 2.10.0 Denial of Service via Attributes","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.","state":0,"publishedAt":"2026-09-07T12:53:49.235+00:00","modifiedAt":"2026-10-08T15:25:50.773+00:00","affected":[{"ecosystem":"Vendor product","name":"commonmark","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"thephpleague\",\n                    \"product\": \"commonmark\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1.5.0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"2.10.0\"\n                        },\n                        {\n                            \"version\": \"2.10.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:composer/league/commonmark\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"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-attributes"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-86428","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-86428","identifiers":["CVE-2026-86428"]},"retained":false,"historicalAffected":[]}],"coverage":[]}