---
id: CVE-2023-32732
aliases:
  - GHSA-9hxf-ppjv-w6rq
  - PYSEC-2026-1426
title: gRPC connection termination issue
summary: gRPC connection termination issue
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
vendor: grpc
product: 'io.grpc:grpc-protobuf'
ecosystem: maven
affected:
  - 'io.grpc:grpc-protobuf >= 1.53.0, < 1.53.1'
  - 'grpcio >= 1.53.0, < 1.53.1'
  - 'grpc >= 1.53.0, < 1.53.1'
  - 'io.grpc:grpc-protobuf >= 1.54.0, < 1.54.2'
  - 'grpcio >= 1.54.0, < 1.54.2'
  - 'grpc >= 1.54.0, < 1.54.2'
patched:
  - 'io.grpc:grpc-protobuf 1.53.1'
  - grpcio 1.53.1
  - grpc 1.53.1
  - 'io.grpc:grpc-protobuf 1.54.2'
  - grpcio 1.54.2
  - grpc 1.54.2
published: '2023-07-06'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:57.444519346Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-9hxf-ppjv-w6rq'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-32732'
  - url: 'https://github.com/grpc/grpc/pull/32309'
  - url: >-
      https://github.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10
  - url: >-
      https://github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946
  - url: 'https://github.com/grpc/grpc/releases/tag/v1.53.1'
  - url: 'https://github.com/grpc/grpc/releases/tag/v1.54.2'
  - url: >-
      https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-32732.yml
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/37IDNVY5AWVH7JDMM2SDTL24ZPPZJNSY
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VWE44J5FG7THHL7XVEVTNIGEYBNKJBLL
tags:
  - osv
  - maven
epss: 0.00527
epssPercentile: 0.42116
ingestedAt: '2026-07-08T18:25:48.028Z'
---

## Overview

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 packages

- `io.grpc:grpc-protobuf >= 1.53.0, < 1.53.1`
- `grpcio >= 1.53.0, < 1.53.1`
- `grpc >= 1.53.0, < 1.53.1`
- `io.grpc:grpc-protobuf >= 1.54.0, < 1.54.2`
- `grpcio >= 1.54.0, < 1.54.2`
- `grpc >= 1.54.0, < 1.54.2`

## Remediation

Upgrade to a patched release:

- `io.grpc:grpc-protobuf 1.53.1`
- `grpcio 1.53.1`
- `grpc 1.53.1`
- `io.grpc:grpc-protobuf 1.54.2`
- `grpcio 1.54.2`
- `grpc 1.54.2`