CVE-2015-5739

Name: CVE-2015-5739
Creator: NVD / NIST
Published: 2017-10-18T20:29:00.277+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 9.37%

Last modified Jun 17, 2026

CVE-2015-5739 is a vulnerability of currently unknown severity. 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.". EPSS estimates a 9.37% chance of exploitation in the next 30 days.

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."

Metrics

EPSS Probability

9.37%

94.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-444

Affected Software

Vendor	Product	Versions
Golang	Go	<= 1.4.2
Fedoraproject	Fedora	21
Fedoraproject	Fedora	22
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Server Aus	7.2
Redhat	Enterprise Linux Server Aus	7.3
Redhat	Enterprise Linux Server Aus	7.4
Redhat	Enterprise Linux Server Aus	7.6
Redhat	Enterprise Linux Server Eus	7.2
Redhat	Enterprise Linux Server Eus	7.3
Redhat	Enterprise Linux Server Eus	7.4
Redhat	Enterprise Linux Server Eus	7.5
Redhat	Enterprise Linux Server Eus	7.6
Redhat	Enterprise Linux Server Tus	7.2
Redhat	Enterprise Linux Server Tus	7.3
Redhat	Enterprise Linux Server Tus	7.6

References

http://lists.fedoraproject.org/pipermail/package-announce/2015-October/167997.htmlThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168029.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1538.htmlThird Party Advisory
http://seclists.org/oss-sec/2015/q3/237Mailing List, Third Party Advisory
http://seclists.org/oss-sec/2015/q3/292Mailing List, Third Party Advisory
http://seclists.org/oss-sec/2015/q3/294Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/76281Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1250352Issue Tracking, Patch, Third Party Advisory
https://github.com/golang/go/commit/117ddcb83d7f42d6aa72241240af99ded81118e9Issue Tracking, Patch, Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-October/167997.htmlThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168029.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1538.htmlThird Party Advisory
http://seclists.org/oss-sec/2015/q3/237Mailing List, Third Party Advisory
http://seclists.org/oss-sec/2015/q3/292Mailing List, Third Party Advisory
http://seclists.org/oss-sec/2015/q3/294Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/76281Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1250352Issue Tracking, Patch, Third Party Advisory
https://github.com/golang/go/commit/117ddcb83d7f42d6aa72241240af99ded81118e9Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Oct 18, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-5739?

How severe is CVE-2015-5739?

Severity scoring for CVE-2015-5739 is pending analysis. The EPSS model estimates a 9.37% probability of exploitation in the next 30 days.

How do I fix CVE-2015-5739?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-5739?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST