Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M
CVE-2026-49459DOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS via attacker-controlled root DOM
Medium 6.1
In plain English
A medium-severity cross-site scripting in DOMPurify from cure53. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(root, { IN_PLACE: true }) could preserve event-handler attributes on an attacker-controlled <form> root when a descendant name clobbered properties checked by _isClobbered, because _forceRemove no-opped on the parent-less root and _sanitizeAttributes returned early. This issue is fixed in version 3.4.6.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-dompurify | no fix listed | DEBIAN-CVE-2026-49459 |
| Debian:13 | node-dompurify | no fix listed | DEBIAN-CVE-2026-49459 |
| Debian:14 | node-dompurify | 3.4.12+dfsg-1 | DEBIAN-CVE-2026-49459 |
| Ubuntu:22.04:LTS | node-dompurify | no fix listed | UBUNTU-CVE-2026-49459 |
| Ubuntu:24.04:LTS | node-dompurify | no fix listed | UBUNTU-CVE-2026-49459 |
| Ubuntu:26.04:LTS | node-dompurify | no fix listed | UBUNTU-CVE-2026-49459 |
| Ubuntu:26.10 | node-dompurify | no fix listed | UBUNTU-CVE-2026-49459 |
| npm | dompurify | 3.4.6 | GHSA-r47g-fvhr-h676 |
Affected products (as reported)
Weakness: CWE-79, CWE-693, CWE-1321 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/cure53/DOMPurify/security/advisories/GHSA-r47g-fvhr-h676 x_refsource_CONFIRM
- https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae x_refsource_MISC
- https://github.com/cure53/DOMPurify/releases/tag/3.4.6 x_refsource_MISC