CVE-2026-41238

unknown

Published 2026-04-22 · Modified 2026-05-05

CVSS v3

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CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N

CVSS v2

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VIR risk

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Description

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-41238

OS impact

OS	Version	Status	Fixed in
debian	bookworm	affected
debian	forky	fixed	`3.4.1+dfsg-1`
debian	sid	fixed	`3.4.1+dfsg-1`
debian	trixie	affected

Package impact

Ecosystem	Package	Vulnerable	Fixed
npm	dompurify	`>=3.0.1,<3.4.0`	`3.4.0`

References

Verify integrity in audit chain (admin only). AS-IS.