Vulnerability-Lookup

RHSA-2026:20322

Vulnerability from csaf_redhat - Published: 2026-05-27 07:20 - Updated: 2026-05-27 15:59

Summary

Red Hat Security Advisory: Red Hat build of MicroShift 4.19.32 security update

Severity

Important

Notes

Topic: Red Hat build of MicroShift release 4.19.32 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 4.19.32. Read the following advisory for the container images for this release: https://access.redhat.com/errata/RHSA-2026:20041 Security Fix(es): * google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation (CVE-2026-33186) All Red Hat build of MicroShift 4.19 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.

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 21 products

Product	Version	Remediation
Unresolved product id: 9Base-RHOSE-4.19:microshift-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.src	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-ai-model-serving-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-ai-model-serving-release-info-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-gateway-api-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-gateway-api-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-gateway-api-release-info-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-greenboot-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-low-latency-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-multus-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-multus-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-multus-release-info-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-networking-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-networking-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-observability-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-olm-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-olm-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-olm-release-info-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-release-info-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.19:microshift-selinux-0:4.19.32-202605212036.p0.g27d51c3.assembly.4.19.32.el9.noarch	—	Vendor Fix fix Workaround

Threats

Impact Important

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:20322	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2449833	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

JSON

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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"
        },
        {
          "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-2026-33186"
        },
        {
          "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": [
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          "details": "For MicroShift 4.19, 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/4.19/html/red_hat_build_of_microshift_release_notes/index",
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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:20322"
        },
        {
          "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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            "attackVector": "NETWORK",
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            "baseScore": 9.1,
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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-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-2026:20322

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

Tags

Sightings

Nomenclature