Bug 2500695 (CVE-2026-49978)

Summary: CVE-2026-49978 dompurify: DOMPurify: Cross-site scripting vulnerability allows code execution
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: aazores, abarbaro, abrianik, akhatavk, akostadi, alizardo, amasferr, amctagga, anjoseph, anpicker, aoconnor, aos-team-art-private, asdas, ataylor, bniver, cdrage, chfoley, cmah, dbruscin, dkeler, dmayorov, dpaolell, dschmidt, eaguilar, ebaron, ehugonne, ewittman, flucifre, fmariani, ggrzybek, gmalinko, gmeno, gparvin, groman, hasun, janstey, jchui, jdelft, jfula, jhe, jlanda, jlledo, jmatsuok, jowilson, jprabhak, jraez, jtolenti, jupierce, jwong, jwon, kaycoth, kbempah, kshier, ktsao, kvanderr, lchilton, lgarciaa, manissin, mbenjamin, mbiarnes, mcarlett, mhackett, nboldt, nipatil, nyancey, oaljalju, omaciel, ometelka, pantinor, parichar, pjindal, ppalepu, ppostler, prdhamdh, psrna, ptisnovs, rgodfrey, rhaigner, rhel-process-autobot, rkubis, rstepani, rushinde, sdawley, sfeifer, sghai, sidsharm, simaishi, solenoci, sostapov, stcannon, suppawar, swoodman, syedriko, tasato, tcunning, teagle, thason, tsedmik, ttakamiy, vereddy, vlaad, watson-tool-maintainers, wtam, xdharmai, yfang, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in DOMPurify, a tool designed to sanitize HTML, MathML, and SVG to prevent cross-site scripting (XSS) attacks. When performing in-place sanitization, DOMPurify could fail to properly process content within shadow DOM elements attached to a `<template>.content`. This oversight allows an attacker to embed malicious code, such as JavaScript, which could then execute when the sanitized template is used by an application, potentially leading to unauthorized actions or information disclosure.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-07-14 21:05:50 UTC 
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.7, DOMPurify IN_PLACE sanitization could skip shadow contents attached to an element inside <template>.content, allowing attacker-controlled markup such as event handlers, JavaScript URLs, or scripts to survive and execute when an application cloned and inserted the sanitized template. This issue is fixed in version 3.4.7.
Comment 7 errata-xmlrpc 2026-08-20 16:07:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:57590 https://access.redhat.com/errata/RHSA-2026:57590
Comment 8 errata-xmlrpc 2026-08-25 10:07:30 UTC 
This issue has been addressed in the following products:

  Red Hat build of Apicurio Registry 3.3.1

Via RHSA-2026:59360 https://access.redhat.com/errata/RHSA-2026:59360
Comment 9 errata-xmlrpc 2026-09-10 16:37:30 UTC 
This issue has been addressed in the following products:

  Red Hat AMQ Broker 7.14.1

Via RHSA-2026:66488 https://access.redhat.com/errata/RHSA-2026:66488
Comment 10 errata-xmlrpc 2026-09-10 23:25:38 UTC 
This issue has been addressed in the following products:

  Red Hat AMQ Broker 7.13.6

Via RHSA-2026:66545 https://access.redhat.com/errata/RHSA-2026:66545