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CVE-2015-5740

28
FAUCET Score

CVE-2015-5740 describes a critical HTTP request smuggling vulnerability in the net/http library of Go versions prior to 1.4.3, affecting products like fedoraproject, golang, and redhat. This flaw allows remote attackers to manipulate HTTP requests by exploiting improper parsing of two Content-length headers. With a CVSS score of 9.8 (CRITICAL), it presents a high-impact threat, enabling full compromise of confidentiality, integrity, and availability with low attack complexity and no user interaction. Despite its severity, there is no evidence of active exploitation, public exploit code, or significant community discussion, suggesting it is not currently a high-profile threat.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.4.2CPE matchmatch criteria
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
21CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*
22CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
7.2CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.66%
Probability of exploitation in next 30 days
EPSS Percentile
88.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0366 is in the 81st percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: golang-0:1.6.3-1.el7_2.1
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) Operational ToolsFixed in: golang
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 8 (Liberty) Operational ToolsFixed in: golang

Vendor Advisories (1)

redhatCVE-2015-5740Moderate

golang: HTTP request smuggling in net/http library

Jul 29, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-October/167997.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-October/168029.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2016-1538.html
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
seclists.org / oss-sec/2015/q3/237
Mailing ListThird Party Advisory
seclists.org / oss-sec/2015/q3/292
Mailing ListThird Party Advisory
seclists.org / oss-sec/2015/q3/294
Mailing ListThird Party Advisory
github.com / golang/go/commit/300d9a21583e7cf0149a778a0611e76ff7c6680f
Issue TrackingPatchThird Party Advisory