Bug 2506841 - CVE-2026-66010 cachelib: DOMPurify: Cross-Site Scripting (XSS) via custom element attribute bypass [fedora-all]
Summary: CVE-2026-66010 cachelib: DOMPurify: Cross-Site Scripting (XSS) via custom ele...
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: cachelib
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Michel Lind
QA Contact:
URL:
Whiteboard: {"flaws": ["6b1db381-899f-4e90-84fe-9...
Depends On:
Blocks: CVE-FalsePositive-Unshipped CVE-2026-66010
TreeView+ depends on / blocked
 
Reported: 2026-07-24 16:54 UTC by Ganesh
Modified: 2026-08-04 19:46 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2026-08-04 19:46:03 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Ganesh 2026-07-24 16:54:55 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Michel Lind 2026-08-04 17:28:18 UTC
This CVE is for a different package in a different ecosystem that happens to share a similar name

Comment 2 Michel Lind 2026-08-04 19:40:26 UTC
Reopening: closed in error by my triage tooling as a cross-ecosystem false positive. Re-triaging.

Comment 3 Michel Lind 2026-08-04 19:46:03 UTC
This CVE is in a JavaScript/NodeJS package; the JavaScript here is not shipped in the binary RPMs.


Note You need to log in before you can comment on or make changes to this bug.