CVE-2024-32976: Envoy can enter an endless loop while decompressing Brotli data with extra input

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-835

Description

Envoy is a cloud-native, open source edge and service proxy. Envoyproxy with a Brotli filter can get into an endless loop during decompression of Brotli data with extra input.

Affected products

envoyproxy envoy: from 1.18.0 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-7wp5-c2vq-4f8m
https://github.com/envoyproxy/envoy/security/advisories/GHSA-7wp5-c2vq-4f8m

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