Bug 2480757 (CVE-2026-27136)

Summary: CVE-2026-27136 golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass
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, akostadi, akoudelk, alizardo, amasferr, amctagga, anjoseph, anpicker, ansmith, anthomas, aoconnor, aruklets, bdettelb, bniver, bparees, ckandaga, cmah, crizzo, dakwon, dhanak, dkeler, dmayorov, doconnor, drosa, dschmidt, dsimansk, dymurray, eaguilar, ebaron, eborisov, eglynn, ehelms, erezende, fdeutsch, flucifre, ggainey, gmeno, gparvin, groman, hasun, ibolton, jbritton, jburrell, jcantril, jchui, jeder, jfula, jhe, jjoyce, jkoehler, jlanda, jlledo, jmatthew, jmontleo, jolong, jowilson, jpasqual, jprabhak, jpretori, jschluet, juwatts, kingland, kshier, ktsao, lball, lbragsta, lchilton, lgamliel, lhh, lphiri, lwan, manissin, mbenjamin, mburns, mgarciac, mhackett, mhulan, mnovotny, mwringe, nboldt, ngough, nmoumoul, nyancey, oaljalju, ometelka, oramraz, osousa, pahickey, pantinor, pcreech, peholase, pgaikwad, pjindal, psrna, ptisnovs, pvasanth, rchan, rekumar, rfreiman, rhaigner, rhel-process-autobot, rjohnson, rojacob, sakbas, sausingh, sbratsla, sdawley, sfeifer, simaishi, slucidi, smallamp, smullick, sostapov, sseago, stcannon, stirabos, suppawar, syedriko, teagle, thason, tmalecek, tsedmik, tzivkovi, vereddy, veshanka, vkarehfa, vvoronko, watson-tool-maintainers, wenshen, whayutin, wtam, xdharmai, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in golang.org/x/net/html. When arbitrary HTML is parsed and then rendered, it can result in an unexpected HTML tree. This allows an attacker to bypass HTML sanitization mechanisms, leading to Cross-Site Scripting (XSS) attacks in applications. Such attacks can result in information disclosure or arbitrary code execution.
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Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-22 16:01:19 UTC
Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.

Comment 3 errata-xmlrpc 2026-07-09 05:14:40 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:37072 https://access.redhat.com/errata/RHSA-2026:37072

Comment 4 errata-xmlrpc 2026-07-09 07:15:50 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:37123 https://access.redhat.com/errata/RHSA-2026:37123

Comment 7 errata-xmlrpc 2026-07-20 15:53:35 UTC
This issue has been addressed in the following products:

  Red Hat Ansible Automation Platform 2.7 for RHEL 9
  Red Hat Ansible Automation Platform 2.7 for RHEL 10

Via RHSA-2026:42080 https://access.redhat.com/errata/RHSA-2026:42080

Comment 8 errata-xmlrpc 2026-07-20 15:59:16 UTC
This issue has been addressed in the following products:

  Red Hat Ansible Automation Platform 2.5 for RHEL 9
  Red Hat Ansible Automation Platform 2.5 for RHEL 8

Via RHSA-2026:42078 https://access.redhat.com/errata/RHSA-2026:42078

Comment 9 errata-xmlrpc 2026-07-20 16:02:24 UTC
This issue has been addressed in the following products:

  Red Hat Ansible Automation Platform 2.6 for RHEL 9
  Red Hat Ansible Automation Platform 2.6 for RHEL 10

Via RHSA-2026:42079 https://access.redhat.com/errata/RHSA-2026:42079