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Vulnerability record · CVE-2015-5741 · published 8 February 2020

CVE-2015-5741: Golang go http request smuggling vulnerability

Golang · Go

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.

9.8 CVSS 3.1 Critical EPSS 2.7% · top 14.5% CWE-444 · HTTP request smuggling
9.8CVSS 3.1 base score, v2 7.5
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

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

References

LinkTags
http://lists.fedoraproject.org/pipermail/package-announce/2015-October/167997.html Mailing ListPatchThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168029.html Mailing ListPatchThird Party Advisory
http://seclists.org/oss-sec/2015/q3/237 Mailing ListThird Party Advisory
http://seclists.org/oss-sec/2015/q3/292 Mailing ListThird Party Advisory
http://seclists.org/oss-sec/2015/q3/294 Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1250352 Issue TrackingPatchThird Party Advisory
https://github.com/golang/go/commit/300d9a21583e7cf0149a778a0611e76ff7c6680f PatchThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-October/167997.html Mailing ListPatchThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168029.html Mailing ListPatchThird Party Advisory
http://seclists.org/oss-sec/2015/q3/237 Mailing ListThird Party Advisory
http://seclists.org/oss-sec/2015/q3/292 Mailing ListThird Party Advisory
http://seclists.org/oss-sec/2015/q3/294 Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1250352 Issue TrackingPatchThird Party Advisory
https://github.com/golang/go/commit/300d9a21583e7cf0149a778a0611e76ff7c6680f PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2015-5741), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.