Homepage

HTTP Request Smuggling The advisory has been revoked - it doesn't affect any version of package libsoup3  (opens in a new tab)

Threat Intelligence

EPSS
0.54% (44th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-UBUNTU2510-LIBSOUP3-14459627
  • published17 Jan 2026
  • disclosed11 Dec 2025
Report a new vulnerability Found a mistake?

Introduced: 11 Dec 2025

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

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:25.10.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libsoup3 package and not the libsoup3 package as distributed by Ubuntu.

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.

References