Vulnerability-Lookup

RHSA-2026:17459

Vulnerability from csaf_redhat - Published: 2026-05-14 06:47 - Updated: 2026-05-19 08:00

Summary

Red Hat Security Advisory: Assisted Installer RHEL 8 components for Multicluster Engine for Kubernetes 2.6.11

Severity

Important

Notes

Topic: Assisted installer RHEL 8 components for the multicluster engine for Kubernetes 2.6.11 General Availability release, with updates to container images.

Details: Assisted Installer RHEL 8 integrates components for the general multicluster engine for Kubernetes 2.6.11 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-2026-33186

A flaw was found in gRPC-Go, the Go language implementation of gRPC. This vulnerability, an authorization bypass, is caused by improper input validation of the HTTP/2 `:path` pseudo-header. A remote attacker can exploit this by sending raw HTTP/2 frames with a malformed `:path` that omits the mandatory leading slash. This allows the attacker to bypass defined security policies, potentially leading to unauthorized access to services or information disclosure.

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

Affected products

Fixed 4 products

Product	Version	Remediation
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:04a8dd280a134d768f6818aa2d2af3ba9ad8f6d2226d536f763f2df3fb4816d8_s390x	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:1f7f0ecf658912226a17b7f08f9c1e1d0f3ebc3b8418e22a1fc4f2c62acd0af0_amd64	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:609777a2ba9b3b9495be6829bbd33c7aeb5e4319d9b3e7015a31014a637999c5_arm64	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:c4eaf8442a49e5ee5cd6e22e9bde7452f8bf7d40ae3faeb5e26019032bb24876_ppc64le	—	Vendor Fix fix Workaround

Known not affected 16 products

Product	Version	Remediation
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:09ba33e68d741089a8e607c20ae1af90ef0f91886dbbfe5631a8b75bb4669db7_ppc64le	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:28c99d3465ede7fb9f34b8eec368093efe6e660b59ea407bfba309bffa63a35e_s390x	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:a805ad07ffbc1fd7de08b256b13fcb9cb8683f3ec13673905e62b4243072ce21_arm64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:c667241161d798e4cbd92213630cffa4753c7234b723f4cd41838c9f7bae99e9_amd64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:042d4a78d0eaa6c231e83065c44c53ec1fefba469d79c40c75e3570123533aea_ppc64le	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:1b4075ffcd5abcc5b7b08d712f68d8dd5a679553e9abcfe01fb762a2eaa90286_amd64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:2282ac22b99efbbe20be15ee09bbbdf22fd6ea8c9a996d33e21ccdc10fdc1458_arm64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:4f149b015e37d57ebbb3c50b40dff8c836293a63c0fcf410a8481f50c675d7de_s390x	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:28007e6ad17db1c94a61585ccee27e988faf87fc0e24330e7d298609687090f3_arm64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:689e63be09baa0e043df979b866d0127f2c8c1e8615725044f3185ed104f6c52_ppc64le	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:da3da57c5810ac09246d6e26c7eb1e0e82237f5cdcfa19a5dada1382e1938986_s390x	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:ea949dcf35cd91da78383750200501e4a2fa4048b568133dbd41a6b4be3357ab_amd64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:2943c61fe779e15791fd0c806628b3e288735ceb18420ae68d4193e404c04a95_ppc64le	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:2c8700d7c53709f0d545dcaf715d467aa2746b172d964f0aaacc54be39b71cda_arm64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:c73bd91b103d4fd08ea587d0b94e0e4bc2a0488102d955e375a6229c3e0046a5_s390x	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:db4f87f2ad1583f656147c4cf1a80becc7947c785022a131843ce60bb05f2f28_amd64	—	Workaround

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

Fixed 12 products

Product	Version	Remediation
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:042d4a78d0eaa6c231e83065c44c53ec1fefba469d79c40c75e3570123533aea_ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:1b4075ffcd5abcc5b7b08d712f68d8dd5a679553e9abcfe01fb762a2eaa90286_amd64	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:2282ac22b99efbbe20be15ee09bbbdf22fd6ea8c9a996d33e21ccdc10fdc1458_arm64	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:4f149b015e37d57ebbb3c50b40dff8c836293a63c0fcf410a8481f50c675d7de_s390x	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:28007e6ad17db1c94a61585ccee27e988faf87fc0e24330e7d298609687090f3_arm64	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:689e63be09baa0e043df979b866d0127f2c8c1e8615725044f3185ed104f6c52_ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:da3da57c5810ac09246d6e26c7eb1e0e82237f5cdcfa19a5dada1382e1938986_s390x	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:ea949dcf35cd91da78383750200501e4a2fa4048b568133dbd41a6b4be3357ab_amd64	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:2943c61fe779e15791fd0c806628b3e288735ceb18420ae68d4193e404c04a95_ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:2c8700d7c53709f0d545dcaf715d467aa2746b172d964f0aaacc54be39b71cda_arm64	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:c73bd91b103d4fd08ea587d0b94e0e4bc2a0488102d955e375a6229c3e0046a5_s390x	—	Vendor Fix fix Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:db4f87f2ad1583f656147c4cf1a80becc7947c785022a131843ce60bb05f2f28_amd64	—	Vendor Fix fix Workaround

Known not affected 8 products

Product	Version	Remediation
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:09ba33e68d741089a8e607c20ae1af90ef0f91886dbbfe5631a8b75bb4669db7_ppc64le	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:28c99d3465ede7fb9f34b8eec368093efe6e660b59ea407bfba309bffa63a35e_s390x	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:a805ad07ffbc1fd7de08b256b13fcb9cb8683f3ec13673905e62b4243072ce21_arm64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:c667241161d798e4cbd92213630cffa4753c7234b723f4cd41838c9f7bae99e9_amd64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:04a8dd280a134d768f6818aa2d2af3ba9ad8f6d2226d536f763f2df3fb4816d8_s390x	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:1f7f0ecf658912226a17b7f08f9c1e1d0f3ebc3b8418e22a1fc4f2c62acd0af0_amd64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:609777a2ba9b3b9495be6829bbd33c7aeb5e4319d9b3e7015a31014a637999c5_arm64	—	Workaround
Unresolved product id: multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:c4eaf8442a49e5ee5cd6e22e9bde7452f8bf7d40ae3faeb5e26019032bb24876_ppc64le	—	Workaround

Threats

Impact Important

References

16 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:17459	self
https://access.redhat.com/security/cve/CVE-2026-33186	external
https://access.redhat.com/security/cve/CVE-2026-34986	external
https://access.redhat.com/security/updates/classi…	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-33186	self
https://bugzilla.redhat.com/show_bug.cgi?id=2449833	external
https://www.cve.org/CVERecord?id=CVE-2026-33186	external
https://nvd.nist.gov/vuln/detail/CVE-2026-33186	external
https://github.com/grpc/grpc-go/security/advisori…	external
https://access.redhat.com/security/cve/CVE-2026-34986	self
https://bugzilla.redhat.com/show_bug.cgi?id=2455470	external
https://www.cve.org/CVERecord?id=CVE-2026-34986	external
https://nvd.nist.gov/vuln/detail/CVE-2026-34986	external
https://github.com/go-jose/go-jose/security/advis…	external
https://pkg.go.dev/github.com/go-jose/go-jose/v4#…	external

JSON

To clipboard

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          "text": "A flaw was found in gRPC-Go, the Go language implementation of gRPC. This vulnerability, an authorization bypass, is caused by improper input validation of the HTTP/2 `:path` pseudo-header. A remote attacker can exploit this by sending raw HTTP/2 frames with a malformed `:path` that omits the mandatory leading slash. This allows the attacker to bypass defined security policies, potentially leading to unauthorized access to services or information disclosure.",
          "title": "Vulnerability description"
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          "text": "google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation",
          "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.",
          "title": "CVSS score applicability"
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-33186"
        },
        {
          "category": "external",
          "summary": "RHBZ#2449833",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449833"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-33186",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-33186"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33186",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33186"
        },
        {
          "category": "external",
          "summary": "https://github.com/grpc/grpc-go/security/advisories/GHSA-p77j-4mvh-x3m3",
          "url": "https://github.com/grpc/grpc-go/security/advisories/GHSA-p77j-4mvh-x3m3"
        }
      ],
      "release_date": "2026-03-20T22:23:32.147000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-14T06:47:45+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/2.11/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/2.11/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 2.11.",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:17459"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, implement infrastructure-level normalization to ensure all incoming HTTP/2 `:path` headers are properly formatted with a leading slash before reaching the gRPC-Go server. This can be achieved by configuring a reverse proxy or API gateway to validate and normalize the `:path` header. Ensure that any such intermediary is properly configured and restarted to apply the changes, which may temporarily impact service availability.",
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          ]
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
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          ]
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation"
    },
    {
      "cve": "CVE-2026-34986",
      "cwe": {
        "id": "CWE-131",
        "name": "Incorrect Calculation of Buffer Size"
      },
      "discovery_date": "2026-04-06T17:01:34.639203+00:00",
      "flags": [
        {
          "label": "vulnerable_code_not_present",
          "product_ids": [
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      ],
      "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": {
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        ]
      },
      "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": "2026-05-14T06:47:45+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/2.11/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/2.11/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 2.11.",
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            "multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:2943c61fe779e15791fd0c806628b3e288735ceb18420ae68d4193e404c04a95_ppc64le",
            "multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:2c8700d7c53709f0d545dcaf715d467aa2746b172d964f0aaacc54be39b71cda_arm64",
            "multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:c73bd91b103d4fd08ea587d0b94e0e4bc2a0488102d955e375a6229c3e0046a5_s390x",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:17459"
        },
        {
          "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 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:09ba33e68d741089a8e607c20ae1af90ef0f91886dbbfe5631a8b75bb4669db7_ppc64le",
            "multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:28c99d3465ede7fb9f34b8eec368093efe6e660b59ea407bfba309bffa63a35e_s390x",
            "multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:a805ad07ffbc1fd7de08b256b13fcb9cb8683f3ec13673905e62b4243072ce21_arm64",
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            "multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:1f7f0ecf658912226a17b7f08f9c1e1d0f3ebc3b8418e22a1fc4f2c62acd0af0_amd64",
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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"
          },
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            "multicluster engine for Kubernetes 2.6:registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:28c99d3465ede7fb9f34b8eec368093efe6e660b59ea407bfba309bffa63a35e_s390x",
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          ]
        }
      ],
      "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"
    }
  ]
}

CVE-2026-34986 (GCVE-0-2026-34986)

Vulnerability from cvelistv5 – Published: 2026-04-06 16:22 – Updated: 2026-04-07 14:21

Title

Go JOSE affect by a panic in JWE decryption

Summary

Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption (JWE), JSON Web Signature (JWS), and JSON Web Token (JWT) standards. Prior to 4.1.4 and 3.0.5, decrypting a JSON Web Encryption (JWE) object will panic if the alg field indicates a key wrapping algorithm (one ending in KW, with the exception of A128GCMKW, A192GCMKW, and A256GCMKW) and the encrypted_key field is empty. The panic happens when cipher.KeyUnwrap() in key_wrap.go attempts to allocate a slice with a zero or negative length based on the length of the encrypted_key. This code path is reachable from ParseEncrypted() / ParseEncryptedJSON() / ParseEncryptedCompact() followed by Decrypt() on the resulting object. Note that the parse functions take a list of accepted key algorithms. If the accepted key algorithms do not include any key wrapping algorithms, parsing will fail and the application will be unaffected. This panic is also reachable by calling cipher.KeyUnwrap() directly with any ciphertext parameter less than 16 bytes long, but calling this function directly is less common. Panics can lead to denial of service. This vulnerability is fixed in 4.1.4 and 3.0.5.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-248 - Uncaught Exception

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/go-jose/go-jose/security/advis…	x_refsource_CONFIRM
https://pkg.go.dev/github.com/go-jose/go-jose/v4#…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
go-jose	go-jose	Affected: >= 4.0.0, < 4.1.4 Affected: < 3.0.5

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-34986",
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                "role": "CISA Coordinator",
                "timestamp": "2026-04-07T14:21:42.477191Z",
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          "value": "Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption (JWE), JSON Web Signature (JWS), and JSON Web Token (JWT) standards. Prior to 4.1.4 and 3.0.5, decrypting a JSON Web Encryption (JWE) object will panic if the alg field indicates a key wrapping algorithm (one ending in KW, with the exception of A128GCMKW, A192GCMKW, and A256GCMKW) and the encrypted_key field is empty. The panic happens when cipher.KeyUnwrap() in key_wrap.go attempts to allocate a slice with a zero or negative length based on the length of the encrypted_key. This code path is reachable from ParseEncrypted() / ParseEncryptedJSON() / ParseEncryptedCompact() followed by Decrypt() on the resulting object. Note that the parse functions take a list of accepted key algorithms. If the accepted key algorithms do not include any key wrapping algorithms, parsing will fail and the application will be unaffected. This panic is also reachable by calling cipher.KeyUnwrap() directly with any ciphertext parameter less than 16 bytes long, but calling this function directly is less common. Panics can lead to denial of service. This vulnerability is fixed in 4.1.4 and 3.0.5."
        }
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      "metrics": [
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            "baseScore": 7.5,
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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    "dateReserved": "2026-03-31T19:38:31.617Z",
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CVE-2026-33186 (GCVE-0-2026-33186)

Vulnerability from cvelistv5 – Published: 2026-03-20 22:23 – Updated: 2026-03-24 18:09

Title

gRPC-Go has an authorization bypass via missing leading slash in :path

Summary

gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests where the `:path` omitted the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`). While the server successfully routed these requests to the correct handler, authorization interceptors (including the official `grpc/authz` package) evaluated the raw, non-canonical path string. Consequently, "deny" rules defined using canonical paths (starting with `/`) failed to match the incoming request, allowing it to bypass the policy if a fallback "allow" rule was present. This affects gRPC-Go servers that use path-based authorization interceptors, such as the official RBAC implementation in `google.golang.org/grpc/authz` or custom interceptors relying on `info.FullMethod` or `grpc.Method(ctx)`; AND that have a security policy contains specific "deny" rules for canonical paths but allows other requests by default (a fallback "allow" rule). The vulnerability is exploitable by an attacker who can send raw HTTP/2 frames with malformed `:path` headers directly to the gRPC server. The fix in version 1.79.3 ensures that any request with a `:path` that does not start with a leading slash is immediately rejected with a `codes.Unimplemented` error, preventing it from reaching authorization interceptors or handlers with a non-canonical path string. While upgrading is the most secure and recommended path, users can mitigate the vulnerability using one of the following methods: Use a validating interceptor (recommended mitigation); infrastructure-level normalization; and/or policy hardening.

Severity ?

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE

CWE-285 - Improper Authorization

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/grpc/grpc-go/security/advisori…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
grpc	grpc-go	Affected: < 1.79.3

Show details on NVD website

JSON

To clipboard

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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.

Action not permitted

RHSA-2026:17459

CVE-2026-34986 (GCVE-0-2026-34986)

CVE-2026-33186 (GCVE-0-2026-33186)

Tags

Sightings

Nomenclature