{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-83606", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-31T20:36:25.743Z", "datePublished": "2026-09-01T14:21:27.215Z", "dateUpdated": "2026-09-01T14:57:43.875Z"}, "containers": {"cna": {"title": "xmldom PI grammar regex ReDoS: quadratic backtracking on unterminated processing instructions", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-1333", "lang": "en", "description": "CWE-1333: Inefficient Regular Expression Complexity", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "vectorString": "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", "version": "4.0"}}], "references": [{"name": "https://github.com/xmldom/xmldom/security/advisories/GHSA-g53g-w8rj-fmg7", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-g53g-w8rj-fmg7"}, {"name": "https://github.com/xmldom/xmldom/pull/1039", "tags": ["x_refsource_MISC"], "url": "https://github.com/xmldom/xmldom/pull/1039"}, {"name": "https://github.com/xmldom/xmldom/commit/73df6b8bdbd86f904b9e8c3ab9c49aa54ef2802e", "tags": ["x_refsource_MISC"], "url": "https://github.com/xmldom/xmldom/commit/73df6b8bdbd86f904b9e8c3ab9c49aa54ef2802e"}, {"name": "https://github.com/xmldom/xmldom/releases/tag/0.9.11", "tags": ["x_refsource_MISC"], "url": "https://github.com/xmldom/xmldom/releases/tag/0.9.11"}], "affected": [{"vendor": "xmldom", "product": "xmldom", "versions": [{"version": ">= 0.9.0-beta.9, < 0.9.11", "status": "affected"}]}, {"vendor": "@xmldom", "product": "xmldom", "versions": [{"version": ">= 0.9.0-beta.9, < 0.9.11", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-01T14:21:27.215Z"}, "descriptions": [{"lang": "en", "value": "xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0-beta.9 until 0.9.11, the processing-instruction production in lib/grammar.js lets the greedy S+ separator and lazy Char*? data group repeatedly repartition a long whitespace tail when the required closing ?> is absent. Both parsePI and parseProcessingInstruction apply the expression to the entire remaining source, causing quadratic backtracking during DOMParser.parseFromString() under default options and allowing a small unauthenticated XML input to stall the Node.js event loop. This issue is fixed in @xmldom/xmldom version 0.9.11."}], "source": {"advisory": "GHSA-g53g-w8rj-fmg7", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-g53g-w8rj-fmg7", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-01T14:57:15.918491Z", "id": "CVE-2026-83606", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-01T14:57:43.875Z"}}]}}

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