Amazon Linux 2 Security Advisory: ALAS2ECS-2026-126
Advisory Released Date: 2026-06-22
Advisory Updated Date: 2026-06-22
Severity:
Important
Issue Overview:
A denial-of-service vulnerability was found in Envoy's HTTP/2 HPACK header compression implementation. A remote attacker could send a specially crafted HTTP/2 request that triggers disproportionately large memory allocations on the server, leading to resource exhaustion and denial of service. (CVE-2026-47774)
Affected Packages:
ecs-service-connect-agent
Note:
This advisory is applicable to Amazon Linux 2 - Ecs Extra. Visit this page to learn more about Amazon Linux 2 (AL2) Extras and this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update ecs-service-connect-agent or yum update --advisory ALAS2ECS-2026-126 to update your system.
New Packages:
aarch64:
ecs-service-connect-agent-v1.34.13.2-1.amzn2.aarch64
src:
ecs-service-connect-agent-v1.34.13.2-1.amzn2.src
x86_64:
ecs-service-connect-agent-v1.34.13.2-1.amzn2.x86_64