RHSA-2026:60668

Vulnerability from csaf_redhat - Published: 2026-09-01 00:17 - Updated: 2026-09-01 18:28
Summary
Red Hat Security Advisory: Red Hat build of MicroShift 4.21.31 security update
Severity
Important
Notes
Topic: Red Hat build of MicroShift release 4.21.31 is now available with updates to packages and images that include a security update. 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 build of MicroShift is Red Hat's light-weight Kubernetes orchestration solution designed for edge device deployments and is built from the edge capabilities of Red Hat OpenShift Container Platform. MicroShift is an application that is deployed on top of Red Hat Enterprise Linux devices at the edge, providing an efficient way to operate single-node clusters in these low-resource environments. This advisory contains the RPM packages for Red Hat build of MicroShift 4.21.31. Read the following advisory for the container images for this release: https://access.redhat.com/errata/RHSA-2026:60477 Security Fix(es): * net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame (CVE-2026-33814) All Red Hat build of MicroShift 4.21 users are advised to use these updated packages and images when they are available in the RPM repository.
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 HTTP/2 protocol implementation within the Go standard library (golang.org/x/net and net/http/internal/http2). A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGS_MAX_FRAME_SIZE parameter set to zero. This malicious frame causes the transport layer to enter an infinite loop of writing CONTINUATION frames, leading to resource exhaustion and a Denial of Service (DoS) condition.

CWE-606 - Unchecked Input for Loop Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.21:microshift-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.src
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-ai-model-serving-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-ai-model-serving-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-cert-manager-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-cert-manager-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-cert-manager-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-gateway-api-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-gateway-api-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-gateway-api-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-greenboot-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-low-latency-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-multus-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-multus-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-multus-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-networking-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-networking-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-observability-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-olm-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-olm-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-olm-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-selinux-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-sriov-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-sriov-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.21:microshift-sriov-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch
Vendor Fix fix
Workaround
Threats
Impact Important

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-33814",
      "cwe": {
        "id": "CWE-606",
        "name": "Unchecked Input for Loop Condition"
      },
      "discovery_date": "2026-05-07T20:01:11.324941+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2467815"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the HTTP/2 protocol implementation within the Go standard library (golang.org/x/net and net/http/internal/http2). A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGS_MAX_FRAME_SIZE parameter set to zero. This malicious frame causes the transport layer to enter an infinite loop of writing CONTINUATION frames, leading to resource exhaustion and a Denial of Service (DoS) condition.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Important denial of service flaw in the Go HTTP/2 protocol implementation allows a remote, unauthenticated attacker to exhaust system resources. By sending a specially crafted HTTP/2 SETTINGS frame with a zero-value SETTINGS_MAX_FRAME_SIZE, the vulnerable Go library enters an infinite loop, impacting the availability of services utilizing HTTP/2.",
          "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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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-33814"
        },
        {
          "category": "external",
          "summary": "RHBZ#2467815",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467815"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-33814",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-33814"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33814",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33814"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/761581",
          "url": "https://go.dev/cl/761581"
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        {
          "category": "external",
          "summary": "https://go.dev/cl/761640",
          "url": "https://go.dev/cl/761640"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/78476",
          "url": "https://go.dev/issue/78476"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M",
          "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-4918",
          "url": "https://pkg.go.dev/vuln/GO-2026-4918"
        }
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      "release_date": "2026-05-07T19:41:17.631000+00:00",
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          "details": "For MicroShift 4.21, read the following documentation for important\ninstructions on how to install the latest RPMs and fully apply this\nasynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/red_hat_build_of_microshift/4.21/html/red_hat_build_of_microshift_release_notes/index",
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        {
          "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": [
            "9Base-RHOSE-4.21:microshift-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64",
            "9Base-RHOSE-4.21:microshift-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.src",
            "9Base-RHOSE-4.21:microshift-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64",
            "9Base-RHOSE-4.21:microshift-ai-model-serving-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64",
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            "9Base-RHOSE-4.21:microshift-cert-manager-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64",
            "9Base-RHOSE-4.21:microshift-cert-manager-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64",
            "9Base-RHOSE-4.21:microshift-cert-manager-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch",
            "9Base-RHOSE-4.21:microshift-gateway-api-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64",
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            "9Base-RHOSE-4.21:microshift-greenboot-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch",
            "9Base-RHOSE-4.21:microshift-low-latency-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch",
            "9Base-RHOSE-4.21:microshift-multus-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64",
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            "9Base-RHOSE-4.21:microshift-multus-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch",
            "9Base-RHOSE-4.21:microshift-networking-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64",
            "9Base-RHOSE-4.21:microshift-networking-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64",
            "9Base-RHOSE-4.21:microshift-observability-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch",
            "9Base-RHOSE-4.21:microshift-olm-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64",
            "9Base-RHOSE-4.21:microshift-olm-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64",
            "9Base-RHOSE-4.21:microshift-olm-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch",
            "9Base-RHOSE-4.21:microshift-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch",
            "9Base-RHOSE-4.21:microshift-selinux-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch",
            "9Base-RHOSE-4.21:microshift-sriov-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.aarch64",
            "9Base-RHOSE-4.21:microshift-sriov-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.x86_64",
            "9Base-RHOSE-4.21:microshift-sriov-release-info-0:4.21.31-202608272317.p0.ge6439cf.assembly.4.21.31.el9.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame"
    }
  ]
}



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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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