This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-66010 →

DEBIAN-CVE-2026-66010

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing att...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 node-dompurify

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 node-dompurify

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 node-dompurify

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.12+dfsg-1"}]}]

References

advisory security-tracker.debian.org