Amazon Linux 2023 Security Advisory: ALAS2023-2026-3388
Advisory Released Date: 2026-11-09
Advisory Updated Date: 2026-11-09
Severity:
Important
Issue Overview:
A flaw was found in haproxy. A remote, unauthenticated attacker can trigger a denial of service (DoS) by sending a specially crafted HTTP/1.1 chunked request. When processing the request, the parser repeatedly re-evaluates the same data without making forward progress, trapping the worker thread in a continuous loop that consumes 100% CPU. Multiple malicious requests can exhaust all worker threads, rendering the proxy completely unresponsive until restarted. (CVE-2026-110354)
Affected Packages:
haproxy
Issue Correction:
Run dnf update haproxy --releasever 2023.12.20261109 or dnf update --advisory ALAS2023-2026-3388 --releasever 2023.12.20261109 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
New Packages:
aarch64:
haproxy-debuginfo-3.0.30-1.amzn2023.0.1.aarch64
haproxy-debugsource-3.0.30-1.amzn2023.0.1.aarch64
haproxy-3.0.30-1.amzn2023.0.1.aarch64
src:
haproxy-3.0.30-1.amzn2023.0.1.src
x86_64:
haproxy-debuginfo-3.0.30-1.amzn2023.0.1.x86_64
haproxy-3.0.30-1.amzn2023.0.1.x86_64
haproxy-debugsource-3.0.30-1.amzn2023.0.1.x86_64