CVE-2015-5739: Fedoraproject Fedora

Critical severity, CVSS 9.8. EPSS: 9.6% chance of exploitation in the next 30 days.

The net/http library in net/textproto/reader.go in Go before 1.4.3 does not properly parse HTTP header keys, which allows remote attackers to conduct HTTP request smuggling attacks via a space instead of a hyphen, as demonstrated by "Content Length" instead of "Content-Length."

Affected products

• Fedoraproject Fedora: version 21 only; version 22 only
• Golang Go: up to and including 1.4.2
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.2 only; version 7.3 only; version 7.4 only; version 7.6 only
• Red Hat Enterprise Linux Server Eus: version 7.2 only; version 7.3 only; version 7.4 only; version 7.5 only; version 7.6 only
• Red Hat Enterprise Linux Server Tus: version 7.2 only; version 7.3 only; version 7.6 only

Published 2017-10-18. Last modified 2026-06-17.