{"id":"CVE-2026-86429","revision":null,"records":[{"revision":"b85bdd18cc3e4f5cb63f41e499ec828d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-86429","aliases":[],"title":"commonmark before 2.9.1 Denial of Service via SmartPunct and Attributes","description":"The league/commonmark (thephpleague/commonmark) library in versions >= 1.5.0 and < 2.9.1 contains quadratic parsing complexity in its SmartPunctExtension and AttributesExtension. When either extension is explicitly registered on the Environment (they are not enabled by default and are excluded from the standard CommonMark and GitHub-Flavored Markdown converters), an unauthenticated attacker can submit small, specially crafted Markdown documents — such as text alternating with unpaired quotes, contiguous runs of block-level attribute blocks, or repeated class attributes — to trigger disproportionate CPU consumption and cause a denial of service. Fixed in 2.9.1.","state":0,"publishedAt":"2026-09-07T12:53:49.905+00:00","modifiedAt":"2026-10-08T15:25:51.367+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\": \"2.9.1\"\n                        },\n                        {\n                            \"version\": \"2.9.1\",\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-jjv6-8j6v-6j52","https://www.vulncheck.com/advisories/commonmark-before-2.9.1-denial-of-service-via-smartpunct-and-attributes"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-86429","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-86429","identifiers":["CVE-2026-86429"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-acbb624a79c244aa868394151a25f053","complete":true,"records":13704,"lastAttemptAt":"2026-11-10T18:24:12.0072206+00:00","lastSuccessAt":"2026-11-10T18:24:12.001+00:00","error":null,"lastVerifiedAt":"2026-11-10T18:24:12.001+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13758,"expectedIdentifiers":13758,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-10T18:23:45.7727801+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-10T18:23:45.7727801+00:00","lastSuccessAt":"2026-11-10T18:23:45.9591411+00:00","error":null,"lastVerifiedAt":"2026-11-10T18:23:45.9591459+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-4459456b8f8c43778c308d7de0a43211","complete":true,"records":13710,"lastAttemptAt":"2026-11-10T18:24:11.1447617+00:00","lastSuccessAt":"2026-11-10T18:24:11.141+00:00","error":null,"lastVerifiedAt":"2026-11-10T18:24:11.141+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13758,"expectedIdentifiers":13758,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-50a085e5b7a5d1546eabdb7e52fab85d658afa8554d3cf95a0891c49d83f2979","complete":true,"records":9935,"lastAttemptAt":"2026-11-10T18:23:45.7142755+00:00","lastSuccessAt":"2026-11-10T16:25:20.0114252+00:00","error":null,"lastVerifiedAt":"2026-11-10T18:23:45.7142755+00:00","snapshotPublishedAt":"2026-11-10T16:18:10+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-26503967ae4379db8f374089589d6e03fb15bd31f820c9e992aaf93840c2236c","complete":true,"records":1971,"lastAttemptAt":"2026-11-10T18:21:27.7170016+00:00","lastSuccessAt":"2026-11-09T21:02:20.472473+00:00","error":null,"lastVerifiedAt":"2026-11-10T18:21:27.7170016+00:00","snapshotPublishedAt":"2026-11-09T20:18:18+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-df497239f2f75af38e095cb498791dad4044a8a9a7f5f0ee6008bb732579ab9d","complete":true,"records":3081,"lastAttemptAt":"2026-11-10T18:23:45.7340645+00:00","lastSuccessAt":"2026-11-10T14:21:34.3717399+00:00","error":null,"lastVerifiedAt":"2026-11-10T18:23:45.7340645+00:00","snapshotPublishedAt":"2026-11-10T14:18:07+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-5bab1d7e68ac802e78d67f5b951f7bcace0c45048e98b39b73b18376172e4b36","complete":true,"records":231619,"lastAttemptAt":"2026-11-10T18:23:45.5819776+00:00","lastSuccessAt":"2026-11-10T18:23:44.1117746+00:00","error":null,"lastVerifiedAt":"2026-11-10T18:23:45.5819776+00:00","snapshotPublishedAt":"2026-11-10T17:33:21+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}