RHSA-2026:5192
Vulnerability from csaf_redhat - Published: 2026-03-20 19:45 - Updated: 2026-04-08 14:06Summary
Red Hat Security Advisory: Red Hat Hardened Images RPM Release
Severity
Moderate
Notes
Topic: Red Hat Hardened Images RPM Release
Details: Red Hat Hardened Images RPM Release
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
An input escaping flaw has been discovered in the golang html/template module. Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can allow XSS if the meta tag also has an http-equiv attribute with the value "refresh". A new GODEBUG setting has been added, htmlmetacontenturlescape, which can be used to disable escaping URLs in actions in the meta content attribute which follow "url=" by setting htmlmetacontenturlescape=0.
5.4 (Medium)
Vendor Fix
Red Hat Hardened Images RPM Release
https://access.redhat.com/errata/RHSA-2026:5192
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References
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"vulnerabilities": [
{
"cve": "CVE-2026-27142",
"cwe": {
"id": "CWE-79",
"name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
},
"discovery_date": "2026-03-06T22:01:56.662646+00:00",
"ids": [
{
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"text": "2445351"
}
],
"notes": [
{
"category": "description",
"text": "An input escaping flaw has been discovered in the golang html/template module. Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can allow XSS if the meta tag also has an http-equiv attribute with the value \"refresh\". A new GODEBUG setting has been added, htmlmetacontenturlescape, which can be used to disable escaping URLs in actions in the meta content attribute which follow \"url=\" by setting htmlmetacontenturlescape=0.",
"title": "Vulnerability description"
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{
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{
"category": "external",
"summary": "https://go.dev/cl/752081",
"url": "https://go.dev/cl/752081"
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"url": "https://go.dev/issue/77954"
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"url": "https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-4603",
"url": "https://pkg.go.dev/vuln/GO-2026-4603"
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"details": "Red Hat Hardened Images RPM Release",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "html/template: URLs in meta content attribute actions are not escaped in html/template"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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