node-dompurify: DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HA...
CVE-2026-66010 is fixed in 5 products on 1 platform, first by DEBIAN-CVE-2026-66010, released July 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.
DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| node-dompurify · Debian 14 | 3.4.12+dfsg-1 | DEBIAN-CVE-2026-66010 | Jul 25, 2026 |
| python-jupytext · Fedora 43 | 1.19.6-1.fc43 | FEDORA-2026-3942AB86FD | Oct 5, 2026 |
| python-jupytext-doc · Fedora 43 | 1.19.6-1.fc43 | FEDORA-2026-3942AB86FD | Oct 5, 2026 |
| python3-jupyterlab-jupytext · Fedora 43 | 1.19.6-1.fc43 | FEDORA-2026-3942AB86FD | Oct 5, 2026 |
| python3-jupytext · Fedora 43 | 1.19.6-1.fc43 | FEDORA-2026-3942AB86FD | Oct 5, 2026 |
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