| Package | Affected versions | Patched versions |
|---|---|---|
| io.grpc:grpc-protobuf | ≥ 1.53.0, < 1.53.1≥ 1.54.0, < 1.54.2 | 1.53.11.54.2 |
| grpcio | ≥ 1.53.0, < 1.53.1≥ 1.54.0, < 1.54.2 | 1.53.11.54.2 |
| grpc | ≥ 1.53.0, < 1.53.1≥ 1.54.0, < 1.54.2 | 1.53.11.54.2 |
| grpc | ≥ 1.53.0, < 1.55.0 | 1.55.0 |
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.
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