Vulnerability · Published Apr 23, 2026 · Assigned by GitHub_M

CVE-2026-41239DOMPurify has a SAFE_FOR_TEMPLATES bypass in RETURN_DOM mode

Medium 6.8

In plain English

A medium-severity cross-site scripting in DOMPurify from cure53. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.2%top 83.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Starting in version 1.0.10 and prior to version 3.4.0, `SAFE_FOR_TEMPLATES` strips `{{...}}` expressions from untrusted HTML. This works in string mode but not with `RETURN_DOM` or `RETURN_DOM_FRAGMENT`, allowing XSS via template-evaluating frameworks like Vue 2. Version 3.4.0 patches the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	node-dompurify	no fix listed	DEBIAN-CVE-2026-41239
Debian:13	node-dompurify	no fix listed	DEBIAN-CVE-2026-41239
Debian:14	node-dompurify	3.4.1+dfsg-1	DEBIAN-CVE-2026-41239
Ubuntu:22.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-41239
Ubuntu:24.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-41239
Ubuntu:25.10	node-dompurify	no fix listed	UBUNTU-CVE-2026-41239
Ubuntu:26.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-41239
Ubuntu:26.10	node-dompurify	no fix listed	UBUNTU-CVE-2026-41239
npm	dompurify	3.4.0	GHSA-crv5-9vww-q3g8

Affected products (as reported)

Vendor	Product	Versions
cure53	DOMPurify	>= 1.0.10, < 3.4.0

Weakness: CWE-79, CWE-1289 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

References

https://github.com/cure53/DOMPurify/security/advisories/GHSA-crv5-9vww-q3g8 x_refsource_CONFIRM
https://github.com/cure53/DOMPurify/releases/tag/3.4.0 x_refsource_MISC