HIGH7.4
PYSEC-2026-1427
Connection confusion in gRPC
Quick fix
PYSEC-2026-1427 — grpcio: upgrade to the fixed version with the command below.
pip install --upgrade 'grpcio>=1.53.1'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.
Are you affected?
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Affected packages
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-32731[ADVISORY]
- https://github.com/grpc/grpc/issues/33463[WEB]
- https://github.com/grpc/grpc/pull/32309[WEB]
- https://github.com/grpc/grpc/pull/33005[WEB]
- https://github.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10[WEB]
- https://github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946[WEB]
- https://github.com/grpc/grpc/releases/tag/v1.53.1[WEB]
- https://github.com/grpc/grpc/releases/tag/v1.54.2[WEB]
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-32731.yml[WEB]
- https://pypi.org/project/grpcio[PACKAGE]
- https://github.com/advisories/GHSA-cfgp-2977-2fmm[ADVISORY]