RHSA-2026:34755

Vulnerability from csaf_redhat - Published: 2026-07-09 14:00 - Updated: 2026-07-22 15:21
Summary
Red Hat Security Advisory: OpenShift Container Platform 4.19.37 packages and security update
Severity
Important
Notes
Topic: Red Hat OpenShift Container Platform release 4.19.37 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red Hat OpenShift Container Platform 4.19. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the RPM packages for Red Hat OpenShift Container Platform 4.19.37. See the following advisory for the container images for this release: https://access.redhat.com/errata/RHSA-2026:34766 Security Fix(es): * Kubelet: CRI-O: kube-apiserver: Kubelet, CRI-O, kube-apiserver: Denial of Service via SPDY streaming code (CVE-2026-35469) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. All OpenShift Container Platform 4.19 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.
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 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.

CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.19:openshift-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.src
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-hyperkube-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-hyperkube-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-hyperkube-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.s390x
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-hyperkube-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-apiserver-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-apiserver-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-apiserver-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.s390x
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-apiserver-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-controller-manager-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-controller-manager-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-controller-manager-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.s390x
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-controller-manager-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-scheduler-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-scheduler-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-scheduler-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.s390x
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kube-scheduler-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.s390x
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.x86_64
Vendor Fix fix
Workaround
Threats
Impact Important

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        "name": "Allocation of Resources Without Limits or Throttling"
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          "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"
        },
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          "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"
        }
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-35469"
        },
        {
          "category": "external",
          "summary": "RHBZ#2457729",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457729"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-35469",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-35469"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-35469",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35469"
        }
      ],
      "release_date": "2026-04-13T23:59:59+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-09T14:00:13+00:00",
          "details": "For OpenShift Container Platform 4.19 see the following documentation,\nwhich will be updated shortly for this release, for important instructions\non how to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/",
          "product_ids": [
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            "9Base-RHOSE-4.19:openshift-kube-scheduler-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.s390x",
            "9Base-RHOSE-4.19:openshift-kube-scheduler-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.x86_64",
            "9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.aarch64",
            "9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.ppc64le",
            "9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.s390x",
            "9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:34755"
        },
        {
          "category": "workaround",
          "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"
          },
          "products": [
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            "9Base-RHOSE-4.19:openshift-kube-controller-manager-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.ppc64le",
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            "9Base-RHOSE-4.19:openshift-kube-controller-manager-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.x86_64",
            "9Base-RHOSE-4.19:openshift-kube-scheduler-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.aarch64",
            "9Base-RHOSE-4.19:openshift-kube-scheduler-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.ppc64le",
            "9Base-RHOSE-4.19:openshift-kube-scheduler-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.s390x",
            "9Base-RHOSE-4.19:openshift-kube-scheduler-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.x86_64",
            "9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.aarch64",
            "9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.ppc64le",
            "9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.s390x",
            "9Base-RHOSE-4.19:openshift-kubelet-0:4.19.0-202606301915.p2.g63adf01.assembly.stream.el9.x86_64"
          ]
        }
      ],
      "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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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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Detection rules are retrieved from Rulezet.

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