ecs-service-connect-agent: Envoy is a high-performance edge/middle/service proxy
CVE-2026-26308 is fixed in ecs-service-connect-agent on 1 platform by ALAS2023-2026-1532 (version v1.34.13.0-1.amzn2023), released March 30, 2026. It is not reported as exploited. Patch Radar priority: High.
Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, the Envoy RBAC (Role-Based Access Control) filter contains a logic vulnerability in how it validates HTTP headers when multiple values are present for the same header name. Instead of validating each header value individually, Envoy concatenates all values into a single comma-separated string. This behavior allows attackers to bypass RBAC policies--specifically "Deny" rules--by sending duplicate headers, effectively obscuring the malicious value from exact-match mechanisms. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ecs-service-connect-agent · amzn 2023 | v1.34.13.0-1.amzn2023 | ALAS2023-2026-1532 | Mar 30, 2026 |
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