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Improper Authorization in google.golang.org/grpc

CVE-2026-33186

  • google.golang.org/grpc
High
9.1/10

Summary

In versions prior to 1.79.3, gRPC-Go contains an authorisation bypass caused by improper input validation of the HTTP/2: path pseudo-header. The server accepts non-canonical paths missing the required leading slash (e.g., Service/Method instead of /Service/Method), and although routing succeeds, authorisation interceptors--including grpc/authz--evaluate the raw, non-canonical path. This causes canonical "deny" rules to fail to match and may allow unauthorized requests when a fallback "allow" rule exists. The issue is fixed in version 1.79.3.

  • LOW
  • NETWORK
  • HIGH
  • UNCHANGED
  • NONE
  • NONE
  • HIGH
  • NONE

CWE-285 - Improper Authorization

The software does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

References

Advisory Timeline

  • Published