Bug 2515838 (CVE-2026-56858)

Summary: CVE-2026-56858 html/template: golang: Go html/template: Cross-Site Scripting via pathological input
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: aazores, abarbaro, abuckta, akhatavk, akostadi, akoudelk, alebedev, alinfoot, alizardo, amasferr, amctagga, anjoseph, anpicker, ansmith, anthomas, aoconnor, aos-team-art-private, aprice, aruklets, asdas, bbrownin, bniver, bparees, bsquizza, ckandaga, cmah, cmitchel, crizzo, dakwon, dfreiber, dhanak, dkeler, dkuc, dmayorov, doconnor, dpaolell, drosa, drow, dschmidt, dsimansk, dtrifiro, dymurray, eaguilar, ebaron, eborisov, eglynn, ehelms, elicohen, flucifre, gbenhaim, ggainey, gmeno, gparvin, groman, hasun, ibolton, jbritton, jburrell, jcantril, jchui, jdelft, jdobes, jeder, jfula, jhe, jjoyce, jlanda, jlledo, jmatsuok, jmatthew, jmontleo, jowilson, jpasqual, jprabhak, jpretori, jsamir, jschluet, jtolenti, jupierce, juwatts, kaycoth, kgaikwad, kingland, kshier, ktsao, lball, lbragsta, lchilton, lgamliel, lgarciaa, lhh, mbenjamin, mbiarnes, mburns, mdellweg, mgarciac, mhackett, mhulan, mnovotny, mstipich, mwringe, nboldt, ngough, niyer, nmoumoul, nyancey, oaljalju, oezr, ometelka, orabin, osousa, pantinor, pcreech, pgaikwad, pjindal, ppalepu, ppostler, prdhamdh, psrna, ptisnovs, pvasanth, rbryant, rchan, rekumar, rexwhite, rhaigner, rhel-process-autobot, rjohnson, rojacob, sakbas, sausingh, sbratsla, sdawley, sfeifer, sghai, sidsharm, simaishi, slucidi, smallamp, sostapov, sseago, stcannon, sthirugn, suppawar, syedriko, teagle, thason, tmalecek, tsedmik, twaugh, tzivkovi, vereddy, veshanka, vkarehfa, vkumar, vlaad, vvoronko, watson-tool-maintainers, weaton, 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 the `html/template` component of Go (golang). Pathological inputs could prematurely close an unescaped forward slash ('/'), allowing an attacker to inject arbitrary content. This could lead to Cross-Site Scripting (XSS), where malicious scripts are executed in a user's browser, potentially compromising user data or actions.
Story Points: ---
Clone Of: Environment:
Last Closed: 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: 2531759, 2531770    
Bug Blocks:    

Description OSIDB Bzimport 2026-08-13 22:25:12 UTC
Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.

Comment 12 errata-xmlrpc 2026-08-26 13:42:13 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:60306 https://access.redhat.com/errata/RHSA-2026:60306

Comment 13 errata-xmlrpc 2026-08-26 13:54:53 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:60305 https://access.redhat.com/errata/RHSA-2026:60305

Comment 14 errata-xmlrpc 2026-08-26 13:56:03 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:60304 https://access.redhat.com/errata/RHSA-2026:60304

Comment 15 errata-xmlrpc 2026-09-01 05:39:13 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:61882 https://access.redhat.com/errata/RHSA-2026:61882

Comment 16 errata-xmlrpc 2026-09-02 06:26:49 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:62405 https://access.redhat.com/errata/RHSA-2026:62405

Comment 17 errata-xmlrpc 2026-09-02 06:34:25 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:62404 https://access.redhat.com/errata/RHSA-2026:62404

Comment 18 errata-xmlrpc 2026-09-02 06:46:22 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:62407 https://access.redhat.com/errata/RHSA-2026:62407

Comment 19 errata-xmlrpc 2026-09-02 07:10:19 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:62406 https://access.redhat.com/errata/RHSA-2026:62406

Comment 20 errata-xmlrpc 2026-09-02 12:18:57 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:62602 https://access.redhat.com/errata/RHSA-2026:62602

Comment 21 errata-xmlrpc 2026-09-02 16:39:37 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:62754 https://access.redhat.com/errata/RHSA-2026:62754

Comment 22 errata-xmlrpc 2026-09-02 16:56:02 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:62753 https://access.redhat.com/errata/RHSA-2026:62753

Comment 23 errata-xmlrpc 2026-09-02 19:13:43 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:62803 https://access.redhat.com/errata/RHSA-2026:62803

Comment 24 errata-xmlrpc 2026-09-03 05:31:34 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:63022 https://access.redhat.com/errata/RHSA-2026:63022

Comment 25 errata-xmlrpc 2026-09-03 09:20:16 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:63130 https://access.redhat.com/errata/RHSA-2026:63130

Comment 26 errata-xmlrpc 2026-09-03 10:59:55 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:63136 https://access.redhat.com/errata/RHSA-2026:63136

Comment 27 errata-xmlrpc 2026-09-03 23:34:52 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:63124 https://access.redhat.com/errata/RHSA-2026:63124

Comment 28 errata-xmlrpc 2026-09-03 23:43:30 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:63119 https://access.redhat.com/errata/RHSA-2026:63119

Comment 29 errata-xmlrpc 2026-09-04 00:43:40 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:63332 https://access.redhat.com/errata/RHSA-2026:63332

Comment 30 errata-xmlrpc 2026-09-04 01:00:04 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:63163 https://access.redhat.com/errata/RHSA-2026:63163

Comment 31 errata-xmlrpc 2026-09-08 02:27:46 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:64777 https://access.redhat.com/errata/RHSA-2026:64777

Comment 32 errata-xmlrpc 2026-09-08 04:39:24 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:64818 https://access.redhat.com/errata/RHSA-2026:64818

Comment 33 errata-xmlrpc 2026-09-08 08:02:43 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:65116 https://access.redhat.com/errata/RHSA-2026:65116

Comment 34 errata-xmlrpc 2026-09-08 10:06:31 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:65117 https://access.redhat.com/errata/RHSA-2026:65117

Comment 35 errata-xmlrpc 2026-09-08 10:45:05 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:65335 https://access.redhat.com/errata/RHSA-2026:65335

Comment 36 errata-xmlrpc 2026-09-08 11:15:56 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:65336 https://access.redhat.com/errata/RHSA-2026:65336

Comment 37 errata-xmlrpc 2026-09-08 11:34:35 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:65359 https://access.redhat.com/errata/RHSA-2026:65359

Comment 38 errata-xmlrpc 2026-09-08 11:46:13 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:65153 https://access.redhat.com/errata/RHSA-2026:65153

Comment 39 errata-xmlrpc 2026-09-08 17:05:19 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:65534 https://access.redhat.com/errata/RHSA-2026:65534

Comment 40 errata-xmlrpc 2026-09-09 09:44:15 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:65880 https://access.redhat.com/errata/RHSA-2026:65880

Comment 41 errata-xmlrpc 2026-09-09 10:40:27 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:65886 https://access.redhat.com/errata/RHSA-2026:65886

Comment 42 errata-xmlrpc 2026-09-09 10:50:03 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:65895 https://access.redhat.com/errata/RHSA-2026:65895

Comment 43 errata-xmlrpc 2026-09-09 11:47:08 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:65918 https://access.redhat.com/errata/RHSA-2026:65918

Comment 44 errata-xmlrpc 2026-09-09 15:02:57 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:66016 https://access.redhat.com/errata/RHSA-2026:66016

Comment 45 errata-xmlrpc 2026-09-10 05:33:14 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:66327 https://access.redhat.com/errata/RHSA-2026:66327

Comment 47 errata-xmlrpc 2026-09-10 15:16:25 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:66459 https://access.redhat.com/errata/RHSA-2026:66459