medium6.1
CVE-2026-49978
DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside <template>.content
Impact
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.7, DOMPurify IN_PLACE sanitization could skip shadow contents attached to an element inside <template>.content, allowing attacker-controlled markup such as event handlers, JavaScript URLs, or scripts to survive and execute when an application cloned and inserted the sanitized template. This issue is fixed in version 3.4.7.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | dompurify | <= 3.4.6 | 3.4.7 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Cure53 | Dompurify | before 3.4.7 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-rp9w-3fw7-7cwq
- https://github.com/cure53/DOMPurify/security/advisories/GHSA-rp9w-3fw7-7cwq
- https://github.com/cure53/DOMPurify/commit/ca30f070c360df162a3e3848e80e6fd3c9e74bff
- https://github.com/cure53/DOMPurify/releases/tag/3.4.7