CVE-2026-39823

Public on

Last Modified: UTC

Moderate Moderate severity What does this mean?
5.4 CVSS v3 Score Breakdown

Description

A flaw was found in the html/template package of Go. A remote attacker could exploit this vulnerability by inserting ASCII whitespaces around the equals sign (=) within a URL's content attribute inside a <meta> tag. This improper escaping could lead to Cross-Site Scripting (XSS), allowing the attacker to execute malicious scripts in the user's browser.

Statement

Red Hat products ship the Go html/template package as a dependency of various Go-based components. The affected functionality involves URL escaping inside <meta> tag content attributes, which requires an application to render user-controlled URLs in meta tags using html/template. While the vulnerable code is present, exploitation requires a specific usage pattern that is uncommon in Red Hat product code paths.

Mitigation

Ensure that user-supplied URLs are validated and sanitized before being passed to Go's `html/template` package for rendering in HTML meta tag content attributes. Avoid rendering untrusted URL data directly in meta tag content attributes.

Additional information

External References

Affected Packages and Issued Red Hat Security Errata

Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.

Products / Services Components State Errata
Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-rhel9 Fix deferred
Builds for Red Hat OpenShift openshift-builds/openshift-builds-waiters-rhel9 Fix deferred
Compliance Operator compliance/openshift-compliance-operator-bundle Fix deferred
Confidential Compute Attestation build-of-trustee/trustee-rhel9-operator Fix deferred
Confidential Compute Attestation confidential-compute-attestation-tech-preview/trustee-rhel9-operator Fix deferred
Confidential Compute Attestation openshift-sandboxed-containers/osc-monitor-rhel9 Fix deferred
Cryostat 4 cryostat/cryostat-storage-rhel9 Fix deferred
Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-rhel9 Fix deferred
Deployment Validation Operator dvo/deployment-validation-rhel8-operator Fix deferred
External Secrets Operator for Red Hat OpenShift external-secrets-operator/external-secrets-rhel9 Fix deferred

Common Vulnerability Scoring System (CVSS) Score Details

Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authorities (CNA) source for its products and services (see Red Hat classifications ).

CVSS v3 Score Breakdown

Red Hat NVD cve.org
CVSS v3 Base Score 5.4 N/A 6.1
Attack Vector Network N/A Network
Attack Complexity Low N/A Low
Privileges Required None N/A None
User Interaction Required N/A Required
Scope Unchanged N/A Changed
Confidentiality Impact Low N/A Low
Integrity Impact Low N/A Low
Availability Impact None N/A None

CVSS v3 Vector

Red Hat CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

cve.org CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

 For open source software shipped by multiple vendors, the CVSS base scores may vary for each vendor's version depending on the version they ship, how they ship it, the platform, and even how the software is compiled. This makes scoring of vulnerabilities difficult for third-party vulnerability databases such as NVD that only provide a single CVSS base score for each vulnerability. Red Hat scores reflect how a vulnerability affects our products specifically.

For more information, see https://access.redhat.com/solutions/762393.

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?
  • "Under investigation" doesn't necessarily mean that the product is affected by this vulnerability. It only means that our Analysis Team is still working on determining whether the product is affected and how it is affected.
  • "Affected" means that our Analysis Team has determined that this product is affected by this vulnerability and might release a fix to address this in the near future.

What can I do if my product is listed as "Will not fix"?

 A "will not fix" status means that a fix for an affected product version is not planned or not possible due to complexity, which may create additional risk.

Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
  • Upgrade to a supported product version that includes a fix for this vulnerability (recommended).
  • Apply a mitigation (if one exists).
  • Open a This content is not included.support case to request a prioritization of releasing a fix for this vulnerability.

What can I do if my product is listed as "Fix deferred"?

 A deferred status means that a fix for an affected product version is not guaranteed due to higher-priority development work.

Available options depend mostly on the Impact of the vulnerability and the current Life Cycle phase of your product. Overall, you have the following options:
  • Apply a mitigation (if one exists).
  • Open a This content is not included.support case to request a prioritization of releasing a fix for this vulnerability.
  • Red Hat Engineering focuses on addressing high-priority issues based on their complexity or limited lifecycle support. Therefore, lower-priority issues will not receive immediate fixes.

What is a mitigation?

 A mitigation is an action that can be taken to reduce the impact of a security vulnerability, without deploying any fixes.

I have a Red Hat product but it is not in the above list, is it affected?

 The listed products were found to include one or more of the components that this vulnerability affects. These products underwent a thorough evaluation to determine their affectedness by this vulnerability. Note that layered products (such as container-based offerings) that consume affected components from any of the products listed in this table may be affected and are not represented.

Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?

 In order to maintain code stability and compatibility, Red Hat usually does not rebase packages to entirely new versions. Instead, we backport fixes and new features to an older version of the package we distribute. This can result in some security scanners that only consider the package version to report the package as vulnerable. To avoid this, we suggest that you use an approved vulnerability scanner from our This content is not included.Red Hat Vulnerability Scanner Certification program.

My product is listed as "Out of Support Scope". What does this mean?

 When a product is listed as "Out of Support Scope", it means a vulnerability with the impact level assigned to this CVE is no longer covered by its current support lifecycle phase. The product has been identified to contain the impacted component, but analysis to determine whether it is affected or not by this vulnerability was not performed. The product should be assumed to be affected. Customers are advised to apply any mitigation options documented on this page, consider removing or disabling the impacted component, or upgrade to a supported version of the product that has an update available.