CVE-2024-34363: Envoy can crash due to uncaught nlohmann JSON exception

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-06-04 · updated 2026-06-17
Weakness: CWE-248

Description

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 products

envoyproxy envoy: from 1.28.0 before 1.28.4; from 1.29.0 before 1.29.5; from 1.30.0 before 1.30.2 — fixed in 1.28.4, 1.29.5, 1.30.2

How to fix

Upgrade to a fixed version: envoyproxy envoy 1.28.4, 1.29.5, 1.30.2. Check the vendor advisory for mitigations.

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-g979-ph9j-5gg4
https://github.com/envoyproxy/envoy/security/advisories/GHSA-g979-ph9j-5gg4

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