GHSA-cfgp-2977-2fmm
GitHub Security Advisory
Connection confusion in gRPC
✓ GitHub Reviewed
HIGH
Has CVE
Advisory Details
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 Packages
Maven
io.grpc:grpc-protobuf
Affected versions:
1.53.0
(fixed in 1.53.1)
PyPI
grpcio
Affected versions:
1.53.0
(fixed in 1.53.1)
RubyGems
grpc
Affected versions:
1.53.0
(fixed in 1.53.1)
PyPI
grpcio
Affected versions:
1.54.0
(fixed in 1.54.2)
RubyGems
grpc
Affected versions:
1.54.0
(fixed in 1.54.2)
Maven
io.grpc:grpc-protobuf
Affected versions:
1.54.0
(fixed in 1.54.2)
Related CVEs
Key Information
7.5
/10
Dataset
Last updated: September 10, 2025 6:31 AM
Data from GitHub Advisory Database. This information is provided for research and educational purposes.