HTTP Request Smuggling Affecting openvpn package, versions [2.7.2,3.2.0)
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.
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-UNMANAGED-OPENVPN-17933149
- published10 Jul 2026
- disclosed8 Jul 2026
- creditUnknown
Introduced: 8 Jul 2026
CVE-2025-3110 (opens in a new tab)How to fix?
Upgrade openvpn to version 3.2.0 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling in the HTTP header parsing process. An attacker can interfere with the interpretation of HTTP requests by submitting specially crafted headers containing bare line-feed sequences, potentially causing the reverse proxy to misinterpret request boundaries and forward unintended requests to the backend server.
Workaround
This vulnerability can be mitigated by configuring the reverse proxy to strictly validate and normalize HTTP header fields, specifically rejecting or sanitizing bare line-feed sequences. Alternatively, restricting direct network access to the server, bypassing the reverse proxy, may also reduce exposure if feasible.