{"id":"CVE-2026-49458","summary":"DOMPurify: Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bound `instanceof` checks","details":"DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accepted same-origin foreign-realm DOM nodes while follow-on checks used parent-realm constructors, causing instanceof checks for forms, named node maps, document fragments, and elements to fail and skip clobber, template-content, and shadow-DOM sanitization branches so executable markup could survive. This issue is fixed in version 3.4.6.","aliases":["GHSA-hpcv-96wg-7vj8"],"modified":"2026-07-23T04:03:09.135835538Z","published":"2026-07-14T19:58:50.397Z","related":["CGA-x73x-rm46-q27f"],"database_specific":{"cwe_ids":["CWE-501","CWE-693","CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49458.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/cure53/DOMPurify/releases/tag/3.4.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49458.json"},{"type":"ADVISORY","url":"https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49458"},{"type":"FIX","url":"https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cure53/dompurify","events":[{"introduced":"0"},{"fixed":"bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.4.6"}],"source":["AFFECTED_FIELD","CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*"}}],"versions":["3.4.5","3.4.4","3.4.3","3.4.2","3.4.1","3.4.0","3.3.3","3.2.3","3.1.3","3.0.4","2.4.3","2.4.2","2.4.1","2.4.0","2.3.12","2.3.11","2.3.10","2.3.9","2.3.8","2.3.6","2.3.5","2.3.4","2.3.3","2.3.2","2.3.1","2.3.0","2.2.9","2.2.8","2.2.7","2.2.6","2.2.4","2.2.3","2.2.2","2.2.0","2.1.1","2.1.0","2.0.17","2.0.16","2.0.15","2.0.14","2.0.13","2.0.12","2.0.11","2.0.10","2.0.9","2.0.8","2.0.6","2.0.5","2.0.4","2.0.3","2.0.2","2.0.1","2.0.0","1.0.11","1.0.10","1.0.9","1.0.8","1.0.7","1.0.6","1.0.5","1.0.4","1.0.3","1.0.2","1.0.1","1.0.0","0.9.0","0.8.9","0.8.8","0.8.7","0.8.6","0.8.5","0.8.4","0.8.3","0.8.2","0.8.1","0.8.0","0.7.3","0.7.2","0.7.1","0.7.0","0.6.7","0.6.6","0.6.5","0.6.4","0.6.3","0.6.2","0.6.1","0.6.0","0.4.5","0.4.4","0.4.3","0.4.2","0.4","0.3","v0.3","0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49458.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}