CVE-2024-34364: Envoy OOM vector from HTTP async client with unbounded response buffer for mirror response

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-06-04 · updated 2026-06-17
Weakness: CWE-400

Description

Envoy is a cloud-native, open source edge and service proxy. Envoy exposed an out-of-memory (OOM) vector from the mirror response, since async HTTP client will buffer the response with an unbounded buffer.

Affected products

envoyproxy envoy: before 1.27.6; 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 1.27.6, 1.28.4, 1.29.5, 1.30.2

How to fix

Upgrade to a fixed version: envoyproxy envoy 1.27.6, 1.28.4, 1.29.5, 1.30.2. Check the vendor advisory for mitigations.

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcj3-h7vf-fw26
https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcj3-h7vf-fw26

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