GHSA-cfgp-2977-2fmmHighCVSS 7.4

Connection confusion in gRPC

Published
July 5, 2023
Last Modified
August 13, 2025

🔗 CVE IDs covered (1)

CVE-2023-32731 →

📋 Description

When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame. This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests from the proxy being interpreted as containing headers from different proxy clients - leading to an information leak that can be used for privilege escalation or data exfiltration.

🎯 Affected products6

  • maven/io.grpc:grpc-protobuf:>= 1.53.0, < 1.53.1
  • pip/grpcio:>= 1.53.0, < 1.53.1
  • rubygems/grpc:>= 1.53.0, < 1.53.1
  • pip/grpcio:>= 1.54.0, < 1.54.2
  • rubygems/grpc:>= 1.54.0, < 1.54.2
  • maven/io.grpc:grpc-protobuf:>= 1.54.0, < 1.54.2

🔗 References (10)