{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59887", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-07T16:40:07.983Z", "datePublished": "2026-07-08T15:58:12.114Z", "dateUpdated": "2026-07-08T15:58:12.114Z"}, "containers": {"cna": {"title": "linkify-it: Quadratic-complexity DoS via the `mailto:` validator scan-loop on attacker text", "problemTypes": [{"descriptions": [{"cweId": "CWE-407", "lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm"}, {"name": "https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe", "tags": ["x_refsource_MISC"], "url": "https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe"}, {"name": "https://github.com/markdown-it/linkify-it/releases/tag/5.0.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/markdown-it/linkify-it/releases/tag/5.0.2"}], "affected": [{"vendor": "markdown-it", "product": "linkify-it", "versions": [{"version": "< 5.0.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T15:58:12.114Z"}, "descriptions": [{"lang": "en", "value": "linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in lib/re.mjs, causing O(n^2) CPU consumption on crafted user text. This issue is fixed in version 5.0.2."}], "source": {"advisory": "GHSA-v245-v573-v5vm", "discovery": "UNKNOWN"}}}}

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