CVE-2024-23323: Envoyproxy Envoy

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Envoy is a high-performance edge/middle/service proxy. The regex expression is compiled for every request and can result in high CPU usage and increased request latency when multiple routes are configured with such matchers. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• Envoyproxy Envoy: from 1.26.0, before 1.26.7 (fixed in 1.26.7); from 1.27.0, before 1.27.3 (fixed in 1.27.3); from 1.28.0, before 1.28.1 (fixed in 1.28.1); from 1.29.0, before 1.29.1 (fixed in 1.29.1)

Published 2024-02-09. Last modified 2026-06-17.