RHSA-2026:17121
Vulnerability from csaf_redhat - Published: 2026-05-13 16:35 - Updated: 2026-05-15 02:39Summary
Red Hat Security Advisory: Assisted Installer RHEL 8 components for Multicluster Engine for Kubernetes 2.8.6
Severity
Important
Notes
Topic: Assisted installer RHEL 8 components for the multicluster engine for Kubernetes 2.8.6 General Availability release, with updates to container images.
Details: Assisted Installer RHEL 8 integrates components for the general multicluster engine
for Kubernetes 2.8.6 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.
A flaw was found in github.com/buger/jsonparser. The Delete function, when processing malformed JSON input, fails to properly validate offsets. This vulnerability can lead to a negative slice index and a runtime panic, allowing a remote attacker to cause a denial of service (DoS) by providing specially crafted JSON data.
7.5 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:319978f477315441f9bcfc8ecb40bde3ad84136d3e634627ce114b400263c593_ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:5c3fb43dee6299526b4c48d8a4c0a551ce138ff468bec663a29b7f174f4f2d9d_amd64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9ed7a2abd8c1949da891af2e7cbec5fbb03a58acf76048078b03c5ead7f4d5cd_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:cf5366023df8dafdc799931d295128ea6b80ef1c84da4fcdede321dd44676390_s390x | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
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)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:319978f477315441f9bcfc8ecb40bde3ad84136d3e634627ce114b400263c593_ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:5c3fb43dee6299526b4c48d8a4c0a551ce138ff468bec663a29b7f174f4f2d9d_amd64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9ed7a2abd8c1949da891af2e7cbec5fbb03a58acf76048078b03c5ead7f4d5cd_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:cf5366023df8dafdc799931d295128ea6b80ef1c84da4fcdede321dd44676390_s390x | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in the SPDY streaming code used by Kubelet, CRI-O, and kube-apiserver. An attacker with specific cluster roles, such as those allowing access to pod port forwarding, execution, or attachment, or node proxying, could exploit this vulnerability. This could lead to a Denial of Service (DoS) by causing the affected components to become unresponsive.
6.5 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:319978f477315441f9bcfc8ecb40bde3ad84136d3e634627ce114b400263c593_ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:5c3fb43dee6299526b4c48d8a4c0a551ce138ff468bec663a29b7f174f4f2d9d_amd64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:9ed7a2abd8c1949da891af2e7cbec5fbb03a58acf76048078b03c5ead7f4d5cd_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: multicluster engine for Kubernetes 2.8:registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:cf5366023df8dafdc799931d295128ea6b80ef1c84da4fcdede321dd44676390_s390x | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
23 references
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"vulnerabilities": [
{
"cve": "CVE-2026-32285",
"cwe": {
"id": "CWE-1285",
"name": "Improper Validation of Specified Index, Position, or Offset in Input"
},
"discovery_date": "2026-03-26T20:01:54.925687+00:00",
"ids": [
{
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"text": "2451846"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in github.com/buger/jsonparser. The Delete function, when processing malformed JSON input, fails to properly validate offsets. This vulnerability can lead to a negative slice index and a runtime panic, allowing a remote attacker to cause a denial of service (DoS) by providing specially crafted JSON data.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "github.com/buger/jsonparser: github.com/buger/jsonparser: Denial of Service via malformed JSON input",
"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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"fixed": [
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451846"
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-32285"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-32285",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32285"
},
{
"category": "external",
"summary": "https://github.com/buger/jsonparser/issues/275",
"url": "https://github.com/buger/jsonparser/issues/275"
},
{
"category": "external",
"summary": "https://github.com/golang/vulndb/issues/4514",
"url": "https://github.com/golang/vulndb/issues/4514"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-4514",
"url": "https://pkg.go.dev/vuln/GO-2026-4514"
}
],
"release_date": "2026-03-26T19:40:51.837000+00:00",
"remediations": [
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"date": "2026-05-13T16:35:04+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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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:17121"
},
{
"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@sha256:319978f477315441f9bcfc8ecb40bde3ad84136d3e634627ce114b400263c593_ppc64le",
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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": [
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "github.com/buger/jsonparser: github.com/buger/jsonparser: Denial of Service via malformed JSON input"
},
{
"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@sha256:319978f477315441f9bcfc8ecb40bde3ad84136d3e634627ce114b400263c593_ppc64le",
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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": "2026-05-13T16:35:04+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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},
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]
}
],
"scores": [
{
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"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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]
}
],
"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": "CVE-2026-35469",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2026-04-13T03:52:35+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2457729"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the SPDY streaming code used by Kubelet, CRI-O, and kube-apiserver. An attacker with specific cluster roles, such as those allowing access to pod port forwarding, execution, or attachment, or node proxying, could exploit this vulnerability. This could lead to a Denial of Service (DoS) by causing the affected components to become unresponsive.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "Kubelet: CRI-O: kube-apiserver: Kubelet, CRI-O, kube-apiserver: Denial of Service via SPDY streaming code",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service flaw affecting OpenShift Container Platform. An attacker with specific elevated cluster roles, such as those permitting pod port forwarding, execution, attachment, or node proxying, could exploit a vulnerability in the SPDY streaming code of Kubelet, CRI-O, and kube-apiserver, leading to unresponsiveness of these critical components.",
"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"
}
],
"product_status": {
"fixed": [
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]
},
"references": [
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},
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457729"
},
{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-35469"
},
{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35469"
}
],
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"date": "2026-05-13T16:35:04+00:00",
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],
"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:17121"
},
{
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"details": "To mitigate this issue, review and restrict the assignment of Kubernetes cluster roles `pods/portforward (create)`, `pods/exec (create)`, `pods/attach (create)`, and `nodes/proxy (get/create)` to untrusted users or service accounts. Ensure that only authorized and necessary entities possess these permissions. Modifying RBAC policies can impact the functionality of applications and services that rely on these permissions; careful testing is recommended.",
"product_ids": [
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]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "Kubelet: CRI-O: kube-apiserver: Kubelet, CRI-O, kube-apiserver: Denial of Service via SPDY streaming code"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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