RHSA-2026:1168
Vulnerability from csaf_redhat - Published: 2026-01-26 09:54 - Updated: 2026-02-11 16:03Summary
Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.1
Notes
Topic
cert-manager Operator for Red Hat OpenShift 1.18.1
Details
The cert-manager Operator for Red Hat OpenShift builds on top of Kubernetes, introducing certificate authorities
and certificates as first-class resource types in the Kubernetes API. This makes it possible to provide
certificates-as-a-service to developers working within your Kubernetes cluster.
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.
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"name": "Improper Certificate Validation"
},
"discovery_date": "2025-12-03T20:01:21.730501+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"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"
},
{
"category": "summary",
"text": "golang: crypto/x509: excluded subdomain constraint does not restrict wildcard SANs",
"title": "Vulnerability summary"
},
{
"category": "other",
"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"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
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},
{
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"title": "Vulnerability description"
},
{
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"text": "urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)",
"title": "Vulnerability summary"
},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-21441"
},
{
"category": "external",
"summary": "RHBZ#2427726",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2427726"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-21441",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-21441"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-21441",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21441"
},
{
"category": "external",
"summary": "https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b",
"url": "https://github.com/urllib3/urllib3/commit/8864ac407bba8607950025e0979c4c69bc7abc7b"
},
{
"category": "external",
"summary": "https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99",
"url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99"
}
],
"release_date": "2026-01-07T22:09:01.936000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-01-26T09:54:57+00:00",
"details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nThe steps to apply the upgraded images are different depending on the installation plan approval policy you used\nwhen installing the cert-manager Operator for Red Hat OpenShift.\n\n- If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a\nnew version of the Operator. No further action is required to upgrade. This is the default setting.\n\n- If you changed the approval policy to `Manual`, then you must manually approve the upgrade to the Operator.\n\nSee https://docs.openshift.com/container-platform/latest/security/cert_manager_operator/index.html for additional\ninformation.",
"product_ids": [
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:1168"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)"
}
]
}
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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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