gRPC connection termination issue
gRPC 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.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | io.grpc:grpc-protobuf | >= 1.53.0, < 1.53.1, >= 1.54.0, < 1.54.2 | 1.53.1, 1.54.2 |
| Python (PyPI) | grpcio | >= 1.53.0, < 1.53.1, >= 1.54.0, < 1.54.2 | 1.53.1, 1.54.2 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-32732
- https://github.com/grpc/grpc/pull/32309
- https://github.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10
- https://github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946
- https://github.com/grpc/grpc/releases/tag/v1.53.1
- https://github.com/grpc/grpc/releases/tag/v1.54.2
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-32732.yml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/37IDNVY5AWVH7JDMM2SDTL24ZPPZJNSY
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VWE44J5FG7THHL7XVEVTNIGEYBNKJBLL
- https://pypi.org/project/grpcio
- https://github.com/advisories/GHSA-9hxf-ppjv-w6rq
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L- Weakness (CWE)
CWE-440- Platform
- Java / Kotlin (Maven), Python (PyPI)
- Package
io.grpc:grpc-protobuf, grpcio- Disclosed
- 06.07.2023
- Updated
- 11.10.2026 13:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1426 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-9hxf-ppjv-w6rq - CC BY 4.0
Vulnerability history: io.grpc:grpc-protobuf
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 07.2023 07.2023
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 1
Disclosures per year
- 2023: 3
- 2024: 0
- 2025: 0
- 2026: 0
-
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