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.
History

Fri, 12 Dec 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Thu, 11 Dec 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 11 Dec 2025 13:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Libsoup: libsoup: duplicate host header handling causes host-parsing discrepancy (first- vs last-value wins)
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-444
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2025-12-11T12:30:59.266Z

Updated: 2025-12-11T15:05:42.681Z

Reserved: 2025-12-11T07:03:53.445Z

Link: CVE-2025-14523

cve-icon Vulnrichment

Updated: 2025-12-11T14:54:32.589Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-11T13:15:58.983

Modified: 2025-12-12T15:18:13.390

Link: CVE-2025-14523

cve-icon Redhat

Severity : Important

Publid Date: 2025-12-11T00:00:00Z

Links: CVE-2025-14523 - Bugzilla