Detections
Analytics
Amazon Linux 2023 : ecs-service-connect-agent (ALAS2023-2026-1893)
high Nessus Plugin ID 322111
Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1893 advisory.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)
Tenable has extracted the preceding description block directly from the tested product security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Run 'dnf update ecs-service-connect-agent --releasever 2023.12.20260622' or or 'dnf update --advisory ALAS2023-2026-1893 --releasever 2023.12.20260622' to update your system.See Also
https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1893.html
Plugin Details
Severity: High
ID: 322111
File Name: al2023_ALAS2023-2026-1893.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 6/22/2026
Updated: 6/22/2026
Supported Sensors: Nessus Agent, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 5.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2026-47774
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:ecs-service-connect-agent, cpe:/o:amazon:linux:2023
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 6/22/2026
Vulnerability Publication Date: 6/17/2026
Reference Information
CVE: CVE-2026-47774