fix(deps): update module google.golang.org/grpc to v1.79.3 [security]

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
google.golang.org/grpc	v1.79.2 → v1.79.3

---

Warning

Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

GitHub Vulnerability Alerts

CVE-2026-33186

Impact

What kind of vulnerability is it? Who is impacted?

It is 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.

Who is impacted?
This affects gRPC-Go servers that meet both of the following criteria:

1. They 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).
2. Their 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.

Patches

Has the problem been patched? What versions should users upgrade to?

Yes, the issue has been patched. The fix 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.

Users should upgrade to the following versions (or newer):

• v1.79.3
• The latest master branch.

It is recommended that all users employing path-based authorization (especially grpc/authz) upgrade as soon as the patch is available in a tagged release.

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

While upgrading is the most secure and recommended path, users can mitigate the vulnerability using one of the following methods:

1. Use a Validating Interceptor (Recommended Mitigation)

Add an "outermost" interceptor to your server that validates the path before any other authorization logic runs:

func pathValidationInterceptor(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (any, error) {
    if info.FullMethod == "" || info.FullMethod[0] != '/' {
        return nil, status.Errorf(codes.Unimplemented, "malformed method name")
    }   
    return handler(ctx, req)
}

// Ensure this is the FIRST interceptor in your chain
s := grpc.NewServer(
    grpc.ChainUnaryInterceptor(pathValidationInterceptor, authzInterceptor),
)

2. Infrastructure-Level Normalization

If your gRPC server is behind a reverse proxy or load balancer (such as Envoy, NGINX, or an L7 Cloud Load Balancer), ensure it is configured to enforce strict HTTP/2 compliance for pseudo-headers and reject or normalize requests where the :path header does not start with a leading slash.

3. Policy Hardening

Switch to a "default deny" posture in your authorization policies (explicitly listing all allowed paths and denying everything else) to reduce the risk of bypasses via malformed inputs.

---

Release Notes

grpc/grpc-go (google.golang.org/grpc)

v1.79.3: Release 1.79.3

Compare Source

Security

• server: fix an authorization bypass where malformed :path headers (missing the leading slash) could bypass path-based restricted "deny" rules in interceptors like grpc/authz. Any request with a non-canonical path is now immediately rejected with an Unimplemented error. (#​8981)

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[Copilot]

Pull request overview

Updates the project’s Go module dependency on google.golang.org/grpc to a patched release addressing a security advisory (authorization bypass via malformed HTTP/2 :path).

Changes:

• Bump google.golang.org/grpc from v1.79.2 to v1.79.3 in go.mod
• Update corresponding checksum entries in go.sum

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
go.mod	Pins gRPC to v1.79.3 to pick up the security fix.
go.sum	Updates module and go.mod hashes for the new gRPC version.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.61%. Comparing base (5225f66) to head (13b5886).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8198      +/-   ##
==========================================
- Coverage   95.63%   95.61%   -0.02%     
==========================================
  Files         318      318              
  Lines       16780    16780              
==========================================
- Hits        16047    16045       -2     
- Misses        578      579       +1     
- Partials      155      156       +1     

Flag	Coverage Δ
badger_direct	9.05% <ø> (ø)
badger_e2e	1.04% <ø> (ø)
cassandra-4.x-direct-manual	13.25% <ø> (ø)
cassandra-4.x-e2e-auto	1.03% <ø> (ø)
cassandra-4.x-e2e-manual	1.03% <ø> (ø)
cassandra-5.x-direct-manual	13.25% <ø> (ø)
cassandra-5.x-e2e-auto	1.03% <ø> (ø)
cassandra-5.x-e2e-manual	1.03% <ø> (ø)
clickhouse	1.16% <ø> (ø)
elasticsearch-6.x-direct	16.83% <ø> (ø)
elasticsearch-7.x-direct	16.86% <ø> (ø)
elasticsearch-8.x-direct	17.01% <ø> (ø)
elasticsearch-8.x-e2e	1.04% <ø> (ø)
elasticsearch-9.x-e2e	1.04% <ø> (ø)
grpc_direct	7.79% <ø> (ø)
grpc_e2e	1.04% <ø> (ø)
kafka-3.x-v2	1.04% <ø> (ø)
memory_v2	1.04% <ø> (ø)
opensearch-1.x-direct	16.91% <ø> (ø)
opensearch-2.x-direct	16.91% <ø> (ø)
opensearch-2.x-e2e	1.04% <ø> (ø)
opensearch-3.x-e2e	1.04% <ø> (ø)
query	1.04% <ø> (ø)
tailsampling-processor	0.52% <ø> (ø)
unittests	94.30% <ø> (-0.02%)	⬇️

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