What’s Vulnerable › Vulnerabilities

CVE-2015-5739

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 9.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-10-18 · updated 2026-06-17
• Weakness: CWE-444

Description

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: 21, 22
• Go: through 1.4.2
• RedHat Enterprise Linux Server: 7.0
• RedHat Enterprise Linux Server Aus: 7.2, 7.3, 7.4, 7.6
• RedHat Enterprise Linux Server Eus: 7.2, 7.3, 7.4, 7.5, 7.6
• RedHat Enterprise Linux Server Tus: 7.2, 7.3, 7.6

References

• http://lists.fedoraproject.org/pipermail/package-announce/2015-October/167997.html
• http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168029.html
• http://rhn.redhat.com/errata/RHSA-2016-1538.html
• http://seclists.org/oss-sec/2015/q3/237
• http://seclists.org/oss-sec/2015/q3/292
• http://seclists.org/oss-sec/2015/q3/294
• http://www.securityfocus.com/bid/76281
• https://bugzilla.redhat.com/show_bug.cgi?id=1250352
• https://github.com/golang/go/commit/117ddcb83d7f42d6aa72241240af99ded81118e9
• http://lists.fedoraproject.org/pipermail/package-announce/2015-October/167997.html
• http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168029.html
• http://rhn.redhat.com/errata/RHSA-2016-1538.html

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