Bug 2496078

Summary: CVE-2026-39823 gh: Go html/template: Cross-Site Scripting via improper URL escaping in meta tag content [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Matteo Signorini <msignori>
Component: ghAssignee: Mikel Olasagasti Uranga <mikel>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: go-sig, maxwell, mikel, suraj.ghimire7
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["004e999a-ba42-4ddf-bdc4-679af3d2b498"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2467811    

Description Matteo Signorini 2026-07-01 17:38:36 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.

CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.