{"id":"CVE-2026-83614","state":"PUBLISHED","title":"xmldom: Quadratic-time parsing via the malformed-input recovery path — `parseElementStartPart` re-scan and `normalize()` adjacent-text merge","description":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom versions 0.3.0 through 0.6.0, two independent quadratic paths can cause denial of service. In lib/sax.js, parseElementStartPart repeatedly rescans a malformed tag name to the next > during single-character recovery; in lib/dom.js, normalize() repeatedly removes and appends adjacent text nodes, causing quadratic reindexing and string rebuilding. The first path is reachable through default DOMParser.parseFromString() processing, while the second is also reachable through a direct normalize() call on a programmatically constructed DOM, and endDocument invokes that normalization after parsing. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.","publishedAt":"2026-09-01T14:41:42.582Z","updatedAt":"2026-09-01T18:05:37.783Z","severity":{"score":8.7,"label":"High","version":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["xmldom xmldom","@xmldom xmldom"],"affected":[{"vendor":"xmldom","product":"xmldom","versions":[{"version":">= 0.3.0, <= 0.6.0","status":"affected"}]},{"vendor":"@xmldom","product":"xmldom","versions":[{"version":">= 0.7.0, < 0.8.15","status":"affected"},{"version":">= 0.9.0, < 0.9.12","status":"affected"}]}],"references":["https://github.com/xmldom/xmldom/security/advisories/GHSA-93r5-fhx6-vmg9","https://github.com/xmldom/xmldom/pull/1071","https://github.com/xmldom/xmldom/pull/1072","https://github.com/xmldom/xmldom/commit/0748720b620555f8c222782dcab575cf0cf403b4","https://github.com/xmldom/xmldom/commit/f40ccb861eee0acbf5ee4feb9a34932e87b329c9","https://github.com/xmldom/xmldom/releases/tag/0.8.15","https://github.com/xmldom/xmldom/releases/tag/0.9.12"],"weaknesses":["CWE-400","CWE-407"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/83xxx/CVE-2026-83614.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-83614","state":"PUBLISHED","datePublished":"2026-09-01T14:41:42.582Z","dateUpdated":"2026-09-01T18:05:37.783Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-31T20:36:25.744Z"},"containers":{"cna":{"title":"xmldom: Quadratic-time parsing via the malformed-input recovery path — `parseElementStartPart` re-scan and `normalize()` adjacent-text merge","descriptions":[{"lang":"en","value":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom versions 0.3.0 through 0.6.0, two independent quadratic paths can cause denial of service. In lib/sax.js, parseElementStartPart repeatedly rescans a malformed tag name to the next > during single-character recovery; in lib/dom.js, normalize() repeatedly removes and appends adjacent text nodes, causing quadratic reindexing and string rebuilding. The first path is reachable through default DOMParser.parseFromString() processing, while the second is also reachable through a direct normalize() call on a programmatically constructed DOM, and endDocument invokes that normalization after parsing. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom."}],"affected":[{"vendor":"xmldom","product":"xmldom","versions":[{"version":">= 0.3.0, <= 0.6.0","status":"affected"}]},{"vendor":"@xmldom","product":"xmldom","versions":[{"version":">= 0.7.0, < 0.8.15","status":"affected"},{"version":">= 0.9.0, < 0.9.12","status":"affected"}]}],"references":[{"url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-93r5-fhx6-vmg9","name":"https://github.com/xmldom/xmldom/security/advisories/GHSA-93r5-fhx6-vmg9","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/xmldom/xmldom/pull/1071","name":"https://github.com/xmldom/xmldom/pull/1071","tags":["x_refsource_MISC"]},{"url":"https://github.com/xmldom/xmldom/pull/1072","name":"https://github.com/xmldom/xmldom/pull/1072","tags":["x_refsource_MISC"]},{"url":"https://github.com/xmldom/xmldom/commit/0748720b620555f8c222782dcab575cf0cf403b4","name":"https://github.com/xmldom/xmldom/commit/0748720b620555f8c222782dcab575cf0cf403b4","tags":["x_refsource_MISC"]},{"url":"https://github.com/xmldom/xmldom/commit/f40ccb861eee0acbf5ee4feb9a34932e87b329c9","name":"https://github.com/xmldom/xmldom/commit/f40ccb861eee0acbf5ee4feb9a34932e87b329c9","tags":["x_refsource_MISC"]},{"url":"https://github.com/xmldom/xmldom/releases/tag/0.8.15","name":"https://github.com/xmldom/xmldom/releases/tag/0.8.15","tags":["x_refsource_MISC"]},{"url":"https://github.com/xmldom/xmldom/releases/tag/0.9.12","name":"https://github.com/xmldom/xmldom/releases/tag/0.9.12","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-407","lang":"en","description":"CWE-407: Inefficient Algorithmic Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-01T14:41:42.582Z"},"source":{"advisory":"GHSA-93r5-fhx6-vmg9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-01T17:34:42.692412Z","id":"CVE-2026-83614","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-01T18:05:37.783Z"}}]}}}