{"id":"CVE-2023-4785","aliases":["GHSA-p25m-jpj4-qcrr","PYSEC-2026-1428"],"title":"Denial of Service Vulnerability in gRPC TCP Server (Posix-compatible platforms)","summary":"Denial of Service Vulnerability in gRPC TCP Server (Posix-compatible platforms)","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"grpc","product":"grpc","ecosystem":"rubygems","affected":["grpc >= 1.56.0, < 1.56.2","grpc >= 1.55.0, < 1.55.3","grpc >= 1.54.0, < 1.54.3","grpc >= 1.53.0, < 1.53.2","grpcio >= 1.55.0, < 1.55.3","grpcio >= 1.54.0, < 1.54.3","grpcio >= 1.53.0, < 1.53.2"],"patched":["grpc 1.56.2","grpc 1.55.3","grpc 1.54.3","grpc 1.53.2","grpcio 1.55.3","grpcio 1.54.3","grpcio 1.53.2"],"published":"2023-09-13","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:49:58.731823990Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-p25m-jpj4-qcrr","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4785"},{"url":"https://github.com/grpc/grpc/pull/33656"},{"url":"https://github.com/grpc/grpc/pull/33667"},{"url":"https://github.com/grpc/grpc/pull/33669"},{"url":"https://github.com/grpc/grpc/pull/33670"},{"url":"https://github.com/grpc/grpc/pull/33672"},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-4785.yml"},{"url":"https://groups.google.com/g/grpc-io/c/LlLkB1CeE4U"},{"url":"https://rubygems.org/gems/grpc/versions/1.53.2"},{"url":"https://rubygems.org/gems/grpc/versions/1.54.3"},{"url":"https://rubygems.org/gems/grpc/versions/1.55.3"},{"url":"https://rubygems.org/gems/grpc/versions/1.56.2"}],"tags":["osv","rubygems"],"epss":0.00773,"epssPercentile":0.54227,"ingestedAt":"2026-07-08T18:25:51.480Z","slug":"CVE-2023-4785","body":"## Overview\n\nLack 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. \n\n## Affected packages\n\n- `grpc >= 1.56.0, < 1.56.2`\n- `grpc >= 1.55.0, < 1.55.3`\n- `grpc >= 1.54.0, < 1.54.3`\n- `grpc >= 1.53.0, < 1.53.2`\n- `grpcio >= 1.55.0, < 1.55.3`\n- `grpcio >= 1.54.0, < 1.54.3`\n- `grpcio >= 1.53.0, < 1.53.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `grpc 1.56.2`\n- `grpc 1.55.3`\n- `grpc 1.54.3`\n- `grpc 1.53.2`\n- `grpcio 1.55.3`\n- `grpcio 1.54.3`\n- `grpcio 1.53.2`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}