---
id: CVE-2023-1428
aliases:
  - GHSA-6628-q6j9-w8vg
  - PYSEC-2026-1425
title: gRPC Reachable Assertion issue
summary: gRPC Reachable Assertion issue
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: 'io.grpc:grpc-protobuf'
ecosystem: maven
affected:
  - 'io.grpc:grpc-protobuf >= 1.51.0, < 1.53.0'
  - 'grpcio >= 1.51.0, < 1.53.0'
  - 'grpc >= 1.51.0, < 1.53.0'
patched:
  - 'io.grpc:grpc-protobuf 1.53.0'
  - grpcio 1.53.0
  - grpc 1.53.0
published: '2023-07-06'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:54.880238612Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-6628-q6j9-w8vg'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-1428'
  - url: 'https://github.com/grpc/grpc/issues/33463'
  - url: >-
      https://github.com/grpc/grpc/commit/2485fa94bd8a723e5c977d55a3ce10b301b437f8
  - url: >-
      https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-1428.yml
tags:
  - osv
  - maven
epss: 0.00412
epssPercentile: 0.3515
ingestedAt: '2026-07-08T18:25:46.290Z'
---

## Overview

There exists an vulnerability causing an abort() to be called in gRPC. 
The following headers cause gRPC's C++ implementation to abort() when called via http2:

te: x (x != trailers)

:scheme: x (x != http, https)

grpclb_client_stats: x (x == anything)

On top of sending one of those headers, a later header must be sent that gets the total header size past 8KB. We recommend upgrading past git commit 2485fa94bd8a723e5c977d55a3ce10b301b437f8 or v1.53 and above.

## Affected packages

- `io.grpc:grpc-protobuf >= 1.51.0, < 1.53.0`
- `grpcio >= 1.51.0, < 1.53.0`
- `grpc >= 1.51.0, < 1.53.0`

## Remediation

Upgrade to a patched release:

- `io.grpc:grpc-protobuf 1.53.0`
- `grpcio 1.53.0`
- `grpc 1.53.0`