RHSA-2026:22258

Vulnerability from csaf_redhat - Published: 2026-06-01 06:42 - Updated: 2026-06-20 07:54
Summary
Red Hat Security Advisory: Assisted Installer RHEL 8 components for Multicluster Engine for Kubernetes 2.8.7
Severity
Important
Notes
Topic: Assisted installer RHEL 8 components for the multicluster engine for Kubernetes 2.8.7 General Availability release, with updates to container images.
Details: Assisted Installer RHEL 8 integrates components for the general multicluster engine for Kubernetes 2.8.7 release that simplify the process of deploying OpenShift Container Platform clusters. The multicluster engine for Kubernetes provides the foundational components that are necessary for the centralized management of multiple Kubernetes-based clusters across data centers, public clouds, and private clouds. You can use the engine to create new Red Hat OpenShift Container Platform clusters, or to import existing Kubernetes-based clusters for management. After the clusters are managed, you can use the APIs that are provided by the engine to distribute configuration based on placement policy.
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.
CVE-2026-32280

A flaw was found in the Go standard library packages `crypto/x509` and `crypto/tls`. During the process of building a certificate chain, an attacker can provide a large number of intermediate certificates. This excessive input is not properly limited, leading to an uncontrolled amount of work being performed. This can result in a denial of service (DoS) condition, making the affected system or application unavailable to legitimate users.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:0578fe32759bccad07a8624017ee4629a21b3623393af20cc16f0819a0d71cf1_arm64 —
Vendor Fix fix
Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:77ea535479c2c3e814107d03bd79f670c7c8ce641ff16482065ac7d5a9d818c3_amd64 —
Vendor Fix fix
Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9bcb737b6ba68fc378edaa56d3b20900807df3f463c45628f4f2bc12d099b03a_ppc64le —
Vendor Fix fix
Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:b9ffe0abc4785e59a27e0a0d2b6e0c6f9242a73691800252d1c9741bfcc389b4_s390x —
Vendor Fix fix
Threats
Impact Important
CVE-2026-34986

A flaw was found in Go JOSE, a library for handling JSON Web Encryption (JWE) objects. A remote attacker could exploit this vulnerability by providing a specially crafted JWE object. When decrypting such an object, if a key wrapping algorithm is specified but the encrypted key field is empty, the application can crash. This leads to a denial of service (DoS), making the affected service unavailable to legitimate users.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-131 - Incorrect Calculation of Buffer Size
Affected products
Product Identifier Version Remediation
Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:0578fe32759bccad07a8624017ee4629a21b3623393af20cc16f0819a0d71cf1_arm64 —
Vendor Fix fix
Workaround
Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:77ea535479c2c3e814107d03bd79f670c7c8ce641ff16482065ac7d5a9d818c3_amd64 —
Vendor Fix fix
Workaround
Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9bcb737b6ba68fc378edaa56d3b20900807df3f463c45628f4f2bc12d099b03a_ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:b9ffe0abc4785e59a27e0a0d2b6e0c6f9242a73691800252d1c9741bfcc389b4_s390x —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

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        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2026-04-08T02:01:19.572351+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2456339"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Go standard library packages `crypto/x509` and `crypto/tls`. During the process of building a certificate chain, an attacker can provide a large number of intermediate certificates. This excessive input is not properly limited, leading to an uncontrolled amount of work being performed. This can result in a denial of service (DoS) condition, making the affected system or application unavailable to legitimate users.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building",
          "title": "Vulnerability summary"
        },
        {
          "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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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-32280"
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456339"
        },
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-32280",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-32280"
        },
        {
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-32280",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32280"
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          "summary": "https://go.dev/cl/758320",
          "url": "https://go.dev/cl/758320"
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          "summary": "https://go.dev/issue/78282",
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      "release_date": "2026-04-08T01:06:58.595000+00:00",
      "remediations": [
        {
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          "date": "2026-06-01T06:42:53+00:00",
          "details": "For more information about Assisted Installer, see the following documentation:\n\nhttps://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.13/html/clusters/cluster_mce_overview#cim-intro\n\nFor multicluster engine for Kubernetes, see the following documentation for\ndetails on how to install the images:\n\nhttps://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.13/html/clusters/cluster_mce_overview#mce-install-intro\n\nThis documentation will be available after the general availability release of Red Hat Advanced Cluster Management 2.13.",
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            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9bcb737b6ba68fc378edaa56d3b20900807df3f463c45628f4f2bc12d099b03a_ppc64le",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:b9ffe0abc4785e59a27e0a0d2b6e0c6f9242a73691800252d1c9741bfcc389b4_s390x"
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        }
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      "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": [
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:0578fe32759bccad07a8624017ee4629a21b3623393af20cc16f0819a0d71cf1_arm64",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:77ea535479c2c3e814107d03bd79f670c7c8ce641ff16482065ac7d5a9d818c3_amd64",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9bcb737b6ba68fc378edaa56d3b20900807df3f463c45628f4f2bc12d099b03a_ppc64le",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:b9ffe0abc4785e59a27e0a0d2b6e0c6f9242a73691800252d1c9741bfcc389b4_s390x"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building"
    },
    {
      "cve": "CVE-2026-34986",
      "cwe": {
        "id": "CWE-131",
        "name": "Incorrect Calculation of Buffer Size"
      },
      "discovery_date": "2026-04-06T17:01:34.639203+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2455470"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Go JOSE, a library for handling JSON Web Encryption (JWE) objects. A remote attacker could exploit this vulnerability by providing a specially crafted JWE object. When decrypting such an object, if a key wrapping algorithm is specified but the encrypted key field is empty, the application can crash. This leads to a denial of service (DoS), making the affected service unavailable to legitimate users.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "github.com/go-jose/go-jose/v3: github.com/go-jose/go-jose/v4: Go JOSE: Denial of Service via crafted JSON Web Encryption (JWE) object",
          "title": "Vulnerability summary"
        },
        {
          "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"
        }
      ],
      "product_status": {
        "fixed": [
          "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:0578fe32759bccad07a8624017ee4629a21b3623393af20cc16f0819a0d71cf1_arm64",
          "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:77ea535479c2c3e814107d03bd79f670c7c8ce641ff16482065ac7d5a9d818c3_amd64",
          "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9bcb737b6ba68fc378edaa56d3b20900807df3f463c45628f4f2bc12d099b03a_ppc64le",
          "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:b9ffe0abc4785e59a27e0a0d2b6e0c6f9242a73691800252d1c9741bfcc389b4_s390x"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-34986"
        },
        {
          "category": "external",
          "summary": "RHBZ#2455470",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455470"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-34986",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-34986"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34986",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34986"
        },
        {
          "category": "external",
          "summary": "https://github.com/go-jose/go-jose/security/advisories/GHSA-78h2-9frx-2jm8",
          "url": "https://github.com/go-jose/go-jose/security/advisories/GHSA-78h2-9frx-2jm8"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/github.com/go-jose/go-jose/v4#pkg-constants",
          "url": "https://pkg.go.dev/github.com/go-jose/go-jose/v4#pkg-constants"
        }
      ],
      "release_date": "2026-04-06T16:22:45.353000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-06-01T06:42:53+00:00",
          "details": "For more information about Assisted Installer, see the following documentation:\n\nhttps://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.13/html/clusters/cluster_mce_overview#cim-intro\n\nFor multicluster engine for Kubernetes, see the following documentation for\ndetails on how to install the images:\n\nhttps://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.13/html/clusters/cluster_mce_overview#mce-install-intro\n\nThis documentation will be available after the general availability release of Red Hat Advanced Cluster Management 2.13.",
          "product_ids": [
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:0578fe32759bccad07a8624017ee4629a21b3623393af20cc16f0819a0d71cf1_arm64",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:77ea535479c2c3e814107d03bd79f670c7c8ce641ff16482065ac7d5a9d818c3_amd64",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9bcb737b6ba68fc378edaa56d3b20900807df3f463c45628f4f2bc12d099b03a_ppc64le",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:b9ffe0abc4785e59a27e0a0d2b6e0c6f9242a73691800252d1c9741bfcc389b4_s390x"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:22258"
        },
        {
          "category": "workaround",
          "details": "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.",
          "product_ids": [
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:0578fe32759bccad07a8624017ee4629a21b3623393af20cc16f0819a0d71cf1_arm64",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:77ea535479c2c3e814107d03bd79f670c7c8ce641ff16482065ac7d5a9d818c3_amd64",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9bcb737b6ba68fc378edaa56d3b20900807df3f463c45628f4f2bc12d099b03a_ppc64le",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:b9ffe0abc4785e59a27e0a0d2b6e0c6f9242a73691800252d1c9741bfcc389b4_s390x"
          ]
        }
      ],
      "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": [
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:0578fe32759bccad07a8624017ee4629a21b3623393af20cc16f0819a0d71cf1_arm64",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:77ea535479c2c3e814107d03bd79f670c7c8ce641ff16482065ac7d5a9d818c3_amd64",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9bcb737b6ba68fc378edaa56d3b20900807df3f463c45628f4f2bc12d099b03a_ppc64le",
            "multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:b9ffe0abc4785e59a27e0a0d2b6e0c6f9242a73691800252d1c9741bfcc389b4_s390x"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "github.com/go-jose/go-jose/v3: github.com/go-jose/go-jose/v4: Go JOSE: Denial of Service via crafted JSON Web Encryption (JWE) object"
    }
  ]
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.