CVE-2026-41238
Fixed in a distro release EPSS <1%CVSS 6.9
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.
Products: cure53 dompurify
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| npm | dompurify | 3.4.0 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | airflow-2 | no fix |
| Chainguard | airflow-core-2 | no fix |
| Chainguard | gitlab-rails-ce-18.1 | no fix |
| Chainguard | gitlab-rails-ce-18.10 | no fix |
| Chainguard | gitlab-rails-ce-18.11 | 18.11.13-r0 |
| Chainguard | gitlab-rails-ce-18.5 | no fix |
| Chainguard | gitlab-rails-ce-18.6 | no fix |
| Chainguard | gitlab-rails-ce-18.7 | no fix |
| Chainguard | gitlab-rails-ce-18.8 | no fix |
| Chainguard | gitlab-rails-ce-18.9 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.1 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.10 | 18.10.8-r8 |
| Chainguard | gitlab-rails-ce-fips-18.11 | 18.11.12-r2 |
| Chainguard | gitlab-rails-ce-fips-18.5 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.6 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.7 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.8 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.9 | 18.9.8-r8 |
| Chainguard | langfuse-fips-3 | 3.164.0-r6 |
| Chainguard | langfuse-fips-3-worker | 3.164.0-r6 |
| Chainguard | nextcloud-server-31 | no fix |
| Chainguard | nextcloud-server-33 | 33.0.6-r0 |
| Chainguard | opensearch-dashboards-3 | 3.6.0-r3 |
| Chainguard | opensearch-dashboards-3-fips | 3.6.0-r4 |
| Chainguard | wazuh-dashboard-alerting-dashboards-plugin | 4.14.4-r3 |
| Chainguard | wazuh-dashboard-anomaly-detection-dashboards-plugin | 4.14.4-r3 |
| Chainguard | wazuh-dashboard-dashboards-maps | 4.14.4-r3 |
| Chainguard | wazuh-dashboard-dashboards-notifications | 4.14.4-r3 |
| Chainguard | wazuh-dashboard-dashboards-reporting | 4.14.4-r3 |
| Chainguard | wazuh-dashboard-dashboards-visualizations | 4.14.4-r3 |
| Chainguard | wazuh-dashboard-index-management-dashboards-plugin | 4.14.4-r3 |
| Chainguard | wazuh-dashboard-plugins | 4.14.4-r3 |
| Chainguard | wazuh-dashboard-plugins-fips | 4.14.4-r2 |
| Debian 12 | node-dompurify | no fix |
| Debian 13 | node-dompurify | no fix |
| Debian 14 | node-dompurify | 3.4.1+dfsg-1 |
| Ubuntu 22.04 LTS | node-dompurify | no fix |
| Ubuntu 24.04 LTS | node-dompurify | no fix |
| Ubuntu 25.10 | node-dompurify | no fix |
| Ubuntu 26.04 LTS | node-dompurify | no fix |
| Ubuntu 26.10 | node-dompurify | no fix |
| Wolfi | nextcloud-server-33 | 33.0.6-r0 |
| Wolfi | opensearch-dashboards-3 | 3.6.0-r3 |