Denial of Service Vulnerability in gRPC TCP Server (Posix-compatible platforms)
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | grpcio | >= 1.55.0, < 1.55.3, >= 1.54.0, < 1.54.3, >= 1.53.0, < 1.53.2 | 1.55.3, 1.54.3, 1.53.2 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-4785
- https://github.com/grpc/grpc/pull/33656
- https://github.com/grpc/grpc/pull/33667
- https://github.com/grpc/grpc/pull/33669
- https://github.com/grpc/grpc/pull/33670
- https://github.com/grpc/grpc/pull/33672
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-4785.yml
- https://groups.google.com/g/grpc-io/c/LlLkB1CeE4U
- https://rubygems.org/gems/grpc/versions/1.53.2
- https://rubygems.org/gems/grpc/versions/1.54.3
- https://rubygems.org/gems/grpc/versions/1.55.3
- https://rubygems.org/gems/grpc/versions/1.56.2
- https://pypi.org/project/grpcio
- https://github.com/advisories/GHSA-p25m-jpj4-qcrr
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-248- Platform
- Python (PyPI)
- Package
grpcio- Disclosed
- 13.09.2023
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1428 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-p25m-jpj4-qcrr - CC BY 4.0
Vulnerability history: grpcio
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 04.2017 09.2023
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 1
- Unrated 1
Disclosures per year
- 2017: 1
- 2018: 0
- 2019: 0
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 5
- 2024: 0
- 2025: 0
- 2026: 0
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