CVE-2016-5386: Fedoraproject Fedora

High severity, CVSS 8.1. EPSS: 5.2% chance of exploitation in the next 30 days.

The net/http package in Go through 1.6 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect CGI applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect a CGI application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue.

Affected products

• Fedoraproject Fedora: version 23 only; version 24 only
• Golang Go: from 1.0, before 1.6.3 (fixed in 1.6.3); version 1.7 only
• Oracle Linux: version 7 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.2 only
• Red Hat Enterprise Linux Server Eus: version 7.2 only

Published 2016-07-19. Last modified 2026-06-17.