CVE-2016-5386

Name: CVE-2016-5386
Creator: NVD / NIST
Published: 2016-07-19T02:00:18.757+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 5.24%

Last modified Jun 17, 2026

CVE-2016-5386 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 5.24% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

5.24%

91.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions	Update
Fedoraproject	Fedora	23	—
Fedoraproject	Fedora	24	—
Oracle	Linux	7	—
Redhat	Enterprise Linux Server	7.0	—
Redhat	Enterprise Linux Server Aus	7.2	—
Redhat	Enterprise Linux Server Eus	7.2	—
Golang	Go	>= 1.0, < 1.6.3	—
Golang	Go	1.7	Rc1

References

http://rhn.redhat.com/errata/RHSA-2016-1538.htmlThird Party Advisory
http://www.kb.cert.org/vuls/id/797896Third Party Advisory, US Government Resource
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.htmlThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1353798Issue Tracking, Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03770en_usThird Party Advisory
https://httpoxy.org/Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WGHKKCFP4PLVSWQKCM3FJJPEWB5ZNTU/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OR52UXGM6RKSCWF3KQMVZGVZVJ3WEESJ/
http://rhn.redhat.com/errata/RHSA-2016-1538.htmlThird Party Advisory
http://www.kb.cert.org/vuls/id/797896Third Party Advisory, US Government Resource
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.htmlThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1353798Issue Tracking, Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03770en_usThird Party Advisory
https://httpoxy.org/Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WGHKKCFP4PLVSWQKCM3FJJPEWB5ZNTU/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OR52UXGM6RKSCWF3KQMVZGVZVJ3WEESJ/

Timeline

Published: Jul 19, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-5386?

How severe is CVE-2016-5386?

CVE-2016-5386 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 5.24% probability of exploitation in the next 30 days.

How do I fix CVE-2016-5386?

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-2016-5386?

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

Scan your code now

Source: NVD / NIST