{"id":"CVE-2026-34601","summary":"xmldom: XML injection via unsafe CDATA serialization allows attacker-controlled markup insertion","details":"xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and `XMLSerializer` module. In xmldom versions 0.6.0 and prior and @xmldom/xmldom prior to versions 0.8.12 and 0.9.9, xmldom/xmldom allows attacker-controlled strings containing the CDATA terminator ]]\u003e to be inserted into a CDATASection node. During serialization, XMLSerializer emitted the CDATA content verbatim without rejecting or safely splitting the terminator. As a result, data intended to remain text-only became active XML markup in the serialized output, enabling XML structure injection and downstream business-logic manipulation. This issue has been patched in xmldom version 0.6.0 and @xmldom/xmldom versions 0.8.12 and 0.9.9.","aliases":["GHSA-wh4c-j3r5-mjhp"],"modified":"2026-07-23T03:56:10.751099337Z","published":"2026-04-02T17:47:13.209Z","related":["CGA-5hr8-xvjm-6p6p","openSUSE-SU-2026:10497-1","openSUSE-SU-2026:10506-1"],"database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"@xmldom/xmldom \u003e= 0.9.0, \u003c 0.9.9"},{"last_affected":"@xmldom/xmldom \u003e= 0.9.0, \u003c 0.9.9"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"GitHub_M","cwe_ids":["CWE-91"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34601.json"},"references":[{"type":"WEB","url":"https://github.com/xmldom/xmldom/releases/tag/0.8.12"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/releases/tag/0.9.9"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34601.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-34601"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34601.json"},{"type":"ADVISORY","url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-wh4c-j3r5-mjhp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34601"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2454595"},{"type":"FIX","url":"https://github.com/xmldom/xmldom/commit/2b852e836ab86dbbd6cbaf0537f584dd0b5ac184"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/xmldom/xmldom","events":[{"introduced":"c80a161172cc4d8733583bf0cf59abfa589f6d9e"},{"fixed":"2b852e836ab86dbbd6cbaf0537f584dd0b5ac184"},{"fixed":"189cb78a83e81e1515880988a399e863a8be85ac"},{"fixed":"7ffb16bce1170c7314151379531147637ab772a1"}],"database_specific":{"extracted_events":[{"introduced":"xmldom \u003c= 0.6.0"},{"last_affected":"xmldom \u003c= 0.6.0"},{"introduced":"@xmldom/xmldom \u003c 0.8.12"},{"last_affected":"@xmldom/xmldom \u003c 0.8.12"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["@xmldom/xmldom \u003c 0.8.12","xmldom \u003c= 0.6.0","0.8.11","0.8.10","0.9.8","0.9.7","0.9.6","0.9.5","0.9.4","0.9.3","0.9.2","0.9.1","0.9.0","0.9.0-beta.11","0.9.0-beta.10","0.8.9","0.9.0-beta.9","0.8.8","0.9.0-beta.8","0.9.0-beta.7","0.8.7","0.8.6","0.9.0-beta.6","0.8.5","0.8.4","0.9.0-beta.5","0.9.0-beta.4","0.8.3","0.9.0-beta.3","0.9.0-beta.2","0.9.0-beta.1","0.8.2","0.8.1","0.8.0","0.7.3","0.7.2","0.7.1","0.7.0+scoped","v0.7.0","0.7.0+unscoped","0.7.0","0.6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34601.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}