High [CVE-2026-56858] Go html/template: Cross-Site Scripting via pathological input
This high-severity Red Hat Linux advisory covers CVE-2026-56858 affecting Assisted Installer for Red Hat OpenShift Container Platform 2, AWS Load Balancer Operator, Builds for Red Hat OpenShift.
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Summary
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. Red Hat severity: Important — CVSS 8.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N).
Weakness: CWE-79.
Affected products named by the advisory: Assisted Installer for Red Hat OpenShift Container Platform 2; AWS Load Balancer Operator; Builds for Red Hat OpenShift; cert-manager Operator for Red Hat OpenShift; and 53 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 2 hours ago·verify at source
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