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6.3 Medium

CVE-2026-84303 gRPC-Go is the Go language implementation of gRPC

Description

gRPC-Go is the Go language implementation of gRPC. Prior to 1.83.1, 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 1.83.1.

Affected products and versions

Product Affected versions Fixed in
grpc-go 1.83 earliest → < 1.83.1 1.83.1

References

Timeline

  1. Published
  2. Last modified

Other CVEs of grpc-go

The 4 CVEs of grpc-go →
CVE-2026-84445 gRPC-Go is the Go language implementation of gRPC 8.7 High CVE-2026-84304 gRPC-Go is the Go language implementation of gRPC 8.7 High CVE-2026-33186 gRPC-Go is the Go language implementation of gRPC 9.1 Critical
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