CVE-2026-84303 - gRPC-Go: xDS RBAC HTTP Filter bypass via mixed-case Header Matching and gRFC A41 validation evasion
Brief
CVE ID : CVE-2026-84303
Published : Sept. 1, 2026, 6:14 p. m.
- 1 hour, 2 minutes ago
Description : gRPC-Go is the Go language implementation of gRPC. Prior to 1.
- 1, the xDS RBAC HTTP filter in internal/xds/httpfilter/rbac/rbac. go does not lowercase header matcher names in normalizeHeaderMatcher even though incoming metadata keys are lowercase. A DENY policy using a mixed-case name such as X-Role or User-Agent therefore does not match and fails open, allowing requests that should be rejected.
The same case mismatch permits :Scheme or Grpc-Status to evade gRFC A41 validation and prevents Host from being rewritten to :authority. This issue is fixed in version 1.
- 1.
Severity: 0.0
- NA
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