Bug 2520512

Summary:	CVE-2026-65913 cachelib: DOMPurify: Cross-Site Scripting (XSS) via prototype pollution in USE_PROFILES mode [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Ganesh <gnaik>
Component:	cachelib	Assignee:	Michel Lind <michel>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	epel10	CC:	michel
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["8c4b2e97-0528-49d9-a541-f40335b4bbb0"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-21 21:08:42 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2443016, 2506429

Description Ganesh 2026-08-20 16:16:16 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 3.3.2 contains a prototype pollution vulnerability in USE_PROFILES mode that allows attackers to bypass attribute filtering by polluting Array.prototype properties. Attackers can set Array.prototype properties like onclick to true, causing DOMPurify to accept event handlers as allowlisted attributes and resulting in DOM-based XSS when sanitized markup is rendered.

Comment 1 Michel Lind 2026-08-21 21:08:42 UTC

This CVE is in a JavaScript/NodeJS package; the JavaScript here is not shipped in the binary RPMs.