{"id":"CVE-2023-32732","aliases":["GHSA-9hxf-ppjv-w6rq","PYSEC-2026-1426"],"title":"gRPC connection termination issue","summary":"gRPC connection termination issue","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","vendor":"grpc","product":"io.grpc:grpc-protobuf","ecosystem":"maven","affected":["io.grpc:grpc-protobuf >= 1.53.0, < 1.53.1","grpcio >= 1.53.0, < 1.53.1","grpc >= 1.53.0, < 1.53.1","io.grpc:grpc-protobuf >= 1.54.0, < 1.54.2","grpcio >= 1.54.0, < 1.54.2","grpc >= 1.54.0, < 1.54.2"],"patched":["io.grpc:grpc-protobuf 1.53.1","grpcio 1.53.1","grpc 1.53.1","io.grpc:grpc-protobuf 1.54.2","grpcio 1.54.2","grpc 1.54.2"],"published":"2023-07-06","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:49:57.444519346Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-9hxf-ppjv-w6rq","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-32732"},{"url":"https://github.com/grpc/grpc/pull/32309"},{"url":"https://github.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10"},{"url":"https://github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946"},{"url":"https://github.com/grpc/grpc/releases/tag/v1.53.1"},{"url":"https://github.com/grpc/grpc/releases/tag/v1.54.2"},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-32732.yml"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/37IDNVY5AWVH7JDMM2SDTL24ZPPZJNSY"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VWE44J5FG7THHL7XVEVTNIGEYBNKJBLL"}],"tags":["osv","maven"],"epss":0.00527,"epssPercentile":0.43611,"ingestedAt":"2026-07-08T18:25:48.028Z","slug":"CVE-2023-32732","body":"## Overview\n\ngRPC contains a vulnerability whereby a client can cause a termination of connection between a HTTP2 proxy and a gRPC server: a base64 encoding error for `-bin` suffixed headers will result in a disconnection by the gRPC server, but is typically allowed by HTTP2 proxies. We recommend upgrading beyond the commit in https://github.com/grpc/grpc/pull/32309.\n\n## Affected packages\n\n- `io.grpc:grpc-protobuf >= 1.53.0, < 1.53.1`\n- `grpcio >= 1.53.0, < 1.53.1`\n- `grpc >= 1.53.0, < 1.53.1`\n- `io.grpc:grpc-protobuf >= 1.54.0, < 1.54.2`\n- `grpcio >= 1.54.0, < 1.54.2`\n- `grpc >= 1.54.0, < 1.54.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `io.grpc:grpc-protobuf 1.53.1`\n- `grpcio 1.53.1`\n- `grpc 1.53.1`\n- `io.grpc:grpc-protobuf 1.54.2`\n- `grpcio 1.54.2`\n- `grpc 1.54.2`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}