Amazon Linux 2023 Security Advisory: ALAS2023-2026-1394
Advisory Released Date: 2026-02-05
Advisory Updated Date: 2026-02-05
Severity:
Important
Issue Overview:
A flaw in libsoup's HTTP header handling allows multiple Host: headers in a request and returns the last occurrence for server-side processing. Common front proxies often honor the first Host: header, so this mismatch can cause vhost confusion where a proxy routes a request to one backend but the backend interprets it as destined for another host. This discrepancy enables request-smuggling style attacks, cache poisoning, or bypassing host-based access controls when an attacker supplies duplicate Host headers. (CVE-2025-14523)
Affected Packages:
libsoup3
Issue Correction:
Run dnf update libsoup3 --releasever 2023.10.20260202 or dnf update --advisory ALAS2023-2026-1394 --releasever 2023.10.20260202 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:
libsoup3-debuginfo-3.6.5-55.amzn2023.aarch64
libsoup3-debugsource-3.6.5-55.amzn2023.aarch64
libsoup3-devel-3.6.5-55.amzn2023.aarch64
libsoup3-3.6.5-55.amzn2023.aarch64
noarch:
libsoup3-doc-3.6.5-55.amzn2023.noarch
src:
libsoup3-3.6.5-55.amzn2023.src
x86_64:
libsoup3-debuginfo-3.6.5-55.amzn2023.x86_64
libsoup3-devel-3.6.5-55.amzn2023.x86_64
libsoup3-3.6.5-55.amzn2023.x86_64
libsoup3-debugsource-3.6.5-55.amzn2023.x86_64