{"schema_version":"1.7.5","id":"PYSEC-2026-1428","published":"2026-07-07T11:45:24.303647Z","modified":"2026-07-07T17:47:41.898069367Z","aliases":["CVE-2023-4785","GHSA-p25m-jpj4-qcrr"],"summary":"Denial of Service Vulnerability in gRPC TCP Server (Posix-compatible platforms)","details":"Lack of error handling in the TCP server in Google's gRPC starting version 1.23 on posix-compatible platforms (ex. Linux) allows an attacker to cause a denial of service by initiating a significant number of connections with the server. Note that gRPC C++ Python, and Ruby are affected, but gRPC Java, and Go are NOT affected. ","affected":[{"package":{"name":"grpcio","ecosystem":"PyPI","purl":"pkg:pypi/grpcio"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.55.0"},{"fixed":"1.55.3"},{"introduced":"1.54.0"},{"fixed":"1.54.3"},{"introduced":"1.53.0"},{"fixed":"1.53.2"}]}],"versions":["1.53.0","1.53.1","1.54.0","1.54.2","1.55.0"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/grpcio/PYSEC-2026-1428.yaml"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4785"},{"type":"WEB","url":"https://github.com/grpc/grpc/pull/33656"},{"type":"WEB","url":"https://github.com/grpc/grpc/pull/33667"},{"type":"WEB","url":"https://github.com/grpc/grpc/pull/33669"},{"type":"WEB","url":"https://github.com/grpc/grpc/pull/33670"},{"type":"WEB","url":"https://github.com/grpc/grpc/pull/33672"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-4785.yml"},{"type":"WEB","url":"https://groups.google.com/g/grpc-io/c/LlLkB1CeE4U"},{"type":"WEB","url":"https://rubygems.org/gems/grpc/versions/1.53.2"},{"type":"WEB","url":"https://rubygems.org/gems/grpc/versions/1.54.3"},{"type":"WEB","url":"https://rubygems.org/gems/grpc/versions/1.55.3"},{"type":"WEB","url":"https://rubygems.org/gems/grpc/versions/1.56.2"},{"type":"PACKAGE","url":"https://pypi.org/project/grpcio"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-p25m-jpj4-qcrr"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}