HTTP Request Smuggling Affecting libsoup package, versions [,3.7.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-LIBSOUP-14413486
- published14 Dec 2025
- disclosed11 Dec 2025
- creditUnknown
Introduced: 11 Dec 2025
CVE-2025-14523 (opens in a new tab)How to fix?
Upgrade libsoup to version 3.7.1 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling via the soup_message_headers_get_one_common is used to construct the request URI. An attacker can bypass host-based access controls or poison caches by sending requests with multiple Host headers, exploiting the difference in how proxies and the backend interpret these headers.
Note:
This is only exploitable if the application is deployed behind a front proxy that processes the first Host header while the backend processes the last.