RHSA-2026:27893

Vulnerability from csaf_redhat - Published: 2026-06-22 12:41 - Updated: 2026-10-09 17:57
Summary
Red Hat Security Advisory: OpenShift Virtualization v4.18 Images
Severity
Important
Notes
Topic: Red Hat OpenShift Virtualization release v4.18 is now available with updates to packages and images that fix several bugs and add enhancements.
Details: OpenShift Virtualization is Red Hat's virtualization solution designed for Red Hat OpenShift Container Platform. This advisory contains OpenShift Virtualization v4.18 images.
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 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.

CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:0b946e36b1480c68b9016b7ad6ee785c68bab137595ee44ce20471cd4b9b132b_s390x —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:edfb4a17b61cc7471c9ef1207bcd5b46384d5a02562906e7d169132e41836af6_amd64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:f1e1d2d866c2a14e921a9f07dae3e0a02fd260d924c86dae67092e3b6c9e0b27_arm64 —
Vendor Fix fix
Workaround
Product Identifier Version Remediation
Unresolved product id: Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:15e2fb3849c5f4026a072a1271385c2eea753e293ed7923c1968496a26477d70_arm64 —
Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:45db9786003fa468897b72001873abfb62bf728898896b6df2cefdc747190df4_s390x —
Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:6e9c1572783151e6851e3c242ec5f15fb6a5b24e58b297e8fbff1461bfbf7c22_amd64 —
Workaround
Threats
Impact Important

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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.",
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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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        {
          "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": "2026-06-22T12:41:19+00:00",
          "details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:0b946e36b1480c68b9016b7ad6ee785c68bab137595ee44ce20471cd4b9b132b_s390x",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:edfb4a17b61cc7471c9ef1207bcd5b46384d5a02562906e7d169132e41836af6_amd64",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:f1e1d2d866c2a14e921a9f07dae3e0a02fd260d924c86dae67092e3b6c9e0b27_arm64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:27893"
        },
        {
          "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.",
          "product_ids": [
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:0b946e36b1480c68b9016b7ad6ee785c68bab137595ee44ce20471cd4b9b132b_s390x",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:edfb4a17b61cc7471c9ef1207bcd5b46384d5a02562906e7d169132e41836af6_amd64",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:f1e1d2d866c2a14e921a9f07dae3e0a02fd260d924c86dae67092e3b6c9e0b27_arm64",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:15e2fb3849c5f4026a072a1271385c2eea753e293ed7923c1968496a26477d70_arm64",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:45db9786003fa468897b72001873abfb62bf728898896b6df2cefdc747190df4_s390x",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:6e9c1572783151e6851e3c242ec5f15fb6a5b24e58b297e8fbff1461bfbf7c22_amd64"
          ]
        }
      ],
      "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"
          },
          "products": [
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:0b946e36b1480c68b9016b7ad6ee785c68bab137595ee44ce20471cd4b9b132b_s390x",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:edfb4a17b61cc7471c9ef1207bcd5b46384d5a02562906e7d169132e41836af6_amd64",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:f1e1d2d866c2a14e921a9f07dae3e0a02fd260d924c86dae67092e3b6c9e0b27_arm64",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:15e2fb3849c5f4026a072a1271385c2eea753e293ed7923c1968496a26477d70_arm64",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:45db9786003fa468897b72001873abfb62bf728898896b6df2cefdc747190df4_s390x",
            "Red Hat Container Native Virtualization 4.18:registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:6e9c1572783151e6851e3c242ec5f15fb6a5b24e58b297e8fbff1461bfbf7c22_amd64"
          ]
        }
      ],
      "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"
    }
  ]
}



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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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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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