CVE-2025-14523
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
11/12/2025
Last modified:
11/12/2025
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.
Impact
Base Score 3.x
8.20
Severity 3.x
HIGH