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CVE-2015-5741

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP...

9.8 Critical

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

2.73%Up 1.4 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 9.8

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.

Record
CVE-2015-5741
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-444
Updated
2026-11-02
CVE List No score

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.

Record
CVE-2015-5741
Updated
2026-11-02
EUVDEUVD-2015-5687 No score

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.

Record
EUVD-2015-5687
Updated
2026-11-03
GitHub AdvisoriesGHSA-vfw2-3mm4-xq2j 9.8

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP...

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.

Record
GHSA-vfw2-3mm4-xq2j
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-444
Updated
2026-11-02
OSVAZL-78996 9.8

CVE-2015-5741 affecting package golang 1.25.7-1

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.

Record
AZL-78996
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVAZL-98973 9.8

CVE-2015-5741 affecting package golang 1.27.1-1

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.

Record
AZL-98973
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2016:1538 5.3

Red Hat Security Advisory: golang security, bug fix, and enhancement update

Record
RHSA-2016:1538
CVSS 3.0
5.3 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2015-5741 9.8

The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.

Record
UBUNTU-CVE-2015-5741
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVGO-2021-0159 No score

Request smuggling due to improper header parsing in net/http

HTTP headers were not properly parsed, which allows remote attackers to conduct HTTP request smuggling attacks via a request that contains Content-Length and Transfer-Encoding header fields.

Record
GO-2021-0159
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
golang
Azure Linux:3
 through 1.25.7-1 None known
golang
Azure Linux:3
 1.27.0 to 1.27.1-1 None known
stdlib
Go
From an advisory covering 3 CVEs
 before 1.4.3
1.4.3
golang
Red Hat:enterprise_linux:7::server
From an advisory covering 5 CVEs
 before 0:1.6.3-1.el7_2.1
0:1.6.3-1.el7_2.1
golang-bin
Red Hat:enterprise_linux:7::server
From an advisory covering 5 CVEs
 before 0:1.6.3-1.el7_2.1
0:1.6.3-1.el7_2.1
golang-docs
Red Hat:enterprise_linux:7::server
From an advisory covering 5 CVEs
 before 0:1.6.3-1.el7_2.1
0:1.6.3-1.el7_2.1
golang-misc
Red Hat:enterprise_linux:7::server
From an advisory covering 5 CVEs
 before 0:1.6.3-1.el7_2.1
0:1.6.3-1.el7_2.1
golang-src
Red Hat:enterprise_linux:7::server
From an advisory covering 5 CVEs
 before 0:1.6.3-1.el7_2.1
0:1.6.3-1.el7_2.1
golang-tests
Red Hat:enterprise_linux:7::server
From an advisory covering 5 CVEs
 before 0:1.6.3-1.el7_2.1
0:1.6.3-1.el7_2.1
gccgo-4.9
Ubuntu:14.04:LTS
 All versions, plus listed versions
4.9-20140213-0ubuntu14.9-20140213-0ubuntu24.9-20140217-0ubuntu14.9-20140222-0ubuntu14.9-20140303-0ubuntu2
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4.9-20140303-0ubuntu34.9-20140321-0ubuntu14.9-20140330-0ubuntu14.9-20140406-0ubuntu14.9.1-0ubuntu14.9.3-0ubuntu4
 None known

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2015-5741 is a critical vulnerability (CVSS 9.8) in Golang Go, published February 8, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.73%, the 86th percentile. No source names a fixed version.

References

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