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{"affected": [{"affectedData": [{"product": "xmldom", "vendor": "xmldom", "versions": [{"status": "affected", "version": ">= 0.9.0-beta.1, < 0.9.12"}]}, {"product": "xmldom", "vendor": "@xmldom", "versions": [{"status": "affected", "version": ">= 0.9.0-beta.1, < 0.9.12"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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.1 until 0.9.12, HTML-mode parsing through DOMParser.parseFromString() mishandles a mixed-case closing tag for the script, style, textarea, or title raw-text elements. parseHtmlSpecialContent, selected by isHTMLRawTextElement or isHTMLEscapableRawTextElement, uses a case-sensitive indexOf() and then calls substring() with a missing-close result of negative one, causing unstable parser progression and quadratic output amplification. A small untrusted text/html document can consequently consume disproportionate CPU and memory when parsed and serialized. This issue is fixed in @xmldom/xmldom version 0.9.12."}], "id": "CVE-2026-83612", "lastModified": "2026-09-01T16:17:26.897", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-83612", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-01T15:29:51.387992Z", "version": "2.0.3"}}]}, "published": "2026-09-01T15:17:39.430", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/xmldom/xmldom/commit/7ced40c06c28d151e996a97045018c3559ae4707"}, {"source": "security-advisories@github.com", "url": "https://github.com/xmldom/xmldom/pull/1071"}, {"source": "security-advisories@github.com", "url": "https://github.com/xmldom/xmldom/releases/tag/0.9.12"}, {"source": "security-advisories@github.com", "url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-6mj3-qw4j-hgrw"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-6mj3-qw4j-hgrw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-178"}, {"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "xmldom: xmldom: Denial of Service via crafted HTML with mixed-case tags", "id": "2526828", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526828"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-178", "details": ["A flaw was found in xmldom, a JavaScript module used for parsing HTML documents. This vulnerability allows a remote attacker to craft a malicious HTML document with specific mixed-case closing tags. When processed, this document can cause the parser to consume excessive CPU and memory, leading to a denial of service for the application."], "name": "CVE-2026-83612", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-console", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-01T14:36:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-83612\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-83612\nhttps://github.com/xmldom/xmldom/commit/7ced40c06c28d151e996a97045018c3559ae4707\nhttps://github.com/xmldom/xmldom/pull/1071\nhttps://github.com/xmldom/xmldom/releases/tag/0.9.12\nhttps://github.com/xmldom/xmldom/security/advisories/GHSA-6mj3-qw4j-hgrw"], "threat_severity": "Important"}