HTTP Request Smuggling Affecting libsoup-devel package, versions <0:2.72.0-12.el9_7.3


Severity

Recommended
0.0
high
0
10

Based on AlmaLinux security rating.

Threat Intelligence

Social Trends
EPSS
0.55% (44th percentile)

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  • Snyk IDSNYK-ALMALINUX9-LIBSOUPDEVEL-15038144
  • published20 Jan 2026
  • disclosed12 Jan 2026

Introduced: 12 Jan 2026

CVE-2025-14523  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 libsoup-devel to version 0:2.72.0-12.el9_7.3 or higher.
This issue was patched in ALSA-2026:0422.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libsoup-devel package and not the libsoup-devel package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1