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PYSEC-2026-1428

Vulnerability from pysec - Published: 2026-07-07 11:45 - Updated: 2026-07-07 17:24
VLAI
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. 

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impacted products
Name purl
grpcio pkg:pypi/grpcio
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "grpcio",
        "purl": "pkg:pypi/grpcio"
      },
      "ranges": [
        {
          "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.53.0",
        "1.53.1",
        "1.54.0",
        "1.54.2",
        "1.55.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2023-4785",
    "GHSA-p25m-jpj4-qcrr"
  ],
  "details": "Lack of error handling in the TCP server in Google\u0027s 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.\u00a0",
  "id": "PYSEC-2026-1428",
  "modified": "2026-07-07T17:24:16.717243Z",
  "published": "2026-07-07T11:45:24.303647Z",
  "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": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Denial of Service Vulnerability in gRPC TCP Server (Posix-compatible platforms)"
}



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