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Vulnerability record · CVE-2016-5386 · published 19 July 2016

CVE-2016-5386: Fedoraproject fedora improper access control vulnerability

Fedoraproject · Fedora

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.

8.1 CVSS 3.1 High EPSS 5.2% · top 7.8% CWE-284 · Improper access control
8.1CVSS 3.1 base score, v2 6.8
5.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

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.

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

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://rhn.redhat.com/errata/RHSA-2016-1538.html Third Party Advisory
http://www.kb.cert.org/vuls/id/797896 Third Party AdvisoryUS Government Resource
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html PatchThird Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1353798 Issue TrackingThird Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03770en_us Third Party Advisory
https://httpoxy.org/ Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WGHKKCFP4PLVSWQKCM3FJJ
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OR52UXGM6RKSCWF3KQMVZGV
http://rhn.redhat.com/errata/RHSA-2016-1538.html Third Party Advisory
http://www.kb.cert.org/vuls/id/797896 Third Party AdvisoryUS Government Resource
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html PatchThird Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1353798 Issue TrackingThird Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03770en_us Third Party Advisory
https://httpoxy.org/ Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WGHKKCFP4PLVSWQKCM3FJJ
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OR52UXGM6RKSCWF3KQMVZGV

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Source: NIST National Vulnerability Database (record CVE-2016-5386), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.