RHSA-2026:7070
Vulnerability from csaf_redhat - Published: 2026-04-08 13:25 - Updated: 2026-04-19 20:08Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
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.
A flaw was found in the crypto/x509 package in the Go standard library. This vulnerability allows a certificate validation bypass via an excluded subdomain constraint in a certificated chain as it does not restrict the usage of wildcard SANs in the leaf certificate.
6.5 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/
https://access.redhat.com/errata/RHSA-2026:7070
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-2025-61727",
"cwe": {
"id": "CWE-295",
"name": "Improper Certificate Validation"
},
"discovery_date": "2025-12-03T20:01:21.730501+00:00",
"ids": [
{
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"text": "2418677"
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"notes": [
{
"category": "description",
"text": "A flaw was found in the crypto/x509 package in the Go standard library. This vulnerability allows a certificate validation bypass via an excluded subdomain constraint in a certificated chain as it does not restrict the usage of wildcard SANs in the leaf certificate.",
"title": "Vulnerability description"
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"category": "summary",
"text": "golang: crypto/x509: excluded subdomain constraint does not restrict wildcard SANs",
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{
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"text": "To exploit this issue, an attacker needs to obtain a leaf certificate with a wildcard SAN (e.g., *.example.com) and the legitimate certificate policy must contain an excluded DNS name constraint (e.g., to prevent issuance for test.example.com), allowing an application using the crypto/x509 package to validate the certificate when it should have been rejected and to be vulnerable to MITM (man-in-the-middle) attacks. Additionally, the attacker does not have full control of what data can be read of modified during the attack. Due to these reasons, this flaw has been rated with a moderate severity.",
"title": "Statement"
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"fixed": [
"Red Hat Hardened Images:golang-fips1-25-main@aarch64",
"Red Hat Hardened Images:golang-fips1-25-main@noarch",
"Red Hat Hardened Images:golang-fips1-25-main@src",
"Red Hat Hardened Images:golang-fips1-25-main@x86_64"
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{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61727"
},
{
"category": "external",
"summary": "https://go.dev/cl/723900",
"url": "https://go.dev/cl/723900"
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"url": "https://go.dev/issue/76442"
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{
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"summary": "https://pkg.go.dev/vuln/GO-2025-4175",
"url": "https://pkg.go.dev/vuln/GO-2025-4175"
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"release_date": "2025-12-03T19:37:15.054000+00:00",
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{
"category": "vendor_fix",
"date": "2026-04-08T13:25:14+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
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"Red Hat Hardened Images:golang-fips1-25-main@noarch",
"Red Hat Hardened Images:golang-fips1-25-main@src",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:golang-fips1-25-main@aarch64",
"Red Hat Hardened Images:golang-fips1-25-main@noarch",
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}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "golang: crypto/x509: excluded subdomain constraint does not restrict wildcard SANs"
}
]
}
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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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