---
id: CVE-2024-34363
title: Envoy can crash due to uncaught nlohmann JSON exception
summary: >-
  Envoy is a cloud-native, open source edge and service proxy. Due to how Envoy
  invoked the nlohmann JSON library, the library could throw an uncaught
  exception from downstream data if incomplete UTF-8 strings were serialized.
  The uncaught…
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'
cvssSource: cna
cwe:
  - CWE-248
vendor: envoyproxy
product: envoy
affected:
  - 'envoy >= 1.30.0, <= 1.30.1'
  - 'envoy >= 1.29.0, <= 1.29.4'
  - 'envoy >= 1.28.0, <= 1.28.3'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-06-21T17:23:29.795163Z'
published: '2024-06-04'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T15:57:40.846Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2024-34363'
references:
  - url: >-
      https://github.com/envoyproxy/envoy/security/advisories/GHSA-g979-ph9j-5gg4
    label: >-
      https://github.com/envoyproxy/envoy/security/advisories/GHSA-g979-ph9j-5gg4
tags:
  - cve.org
epss: 0.00674
epssPercentile: 0.52269
ingestedAt: '2026-11-05T21:36:00.936Z'
---

## Overview

Envoy is a cloud-native, open source edge and service proxy. Due to how Envoy invoked the nlohmann JSON library, the library could throw an uncaught exception from downstream data if incomplete UTF-8 strings were serialized. The uncaught exception would cause Envoy to crash.

## Affected

- `envoy >= 1.30.0, <= 1.30.1`
- `envoy >= 1.29.0, <= 1.29.4`
- `envoy >= 1.28.0, <= 1.28.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.