CVE-2015-5739
The net/http library in net/textproto/reader.go in Go before 1.4.3 does not properly parse HTTP header keys, which allows remote attackers to conduct HTTP request smuggling attacks via a space instead of a hyphen, as demonstrated by "Content Length"…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (9.63%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The net/http library in net/textproto/reader.go in Go before 1.4.3 does not properly parse HTTP header keys, which allows remote attackers to conduct HTTP request smuggling attacks via a space instead of a hyphen, as demonstrated by "Content Length" instead of "Content-Length."
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 9.63% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- golang/go · fedoraproject/fedora · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux server tus
- Source
- cve@mitre.org
EPSS 9.6% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/167997.htmlThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168029.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-1538.htmlThird Party Advisory
- http://seclists.org/oss-sec/2015/q3/237Mailing List, Third Party Advisory
- http://seclists.org/oss-sec/2015/q3/292Mailing List, Third Party Advisory
- http://seclists.org/oss-sec/2015/q3/294Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/76281Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1250352Issue Tracking, Patch, Third Party Advisory
- https://github.com/golang/go/commit/117ddcb83d7f42d6aa72241240af99ded81118e9Issue Tracking, Patch, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/167997.htmlThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168029.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-1538.htmlThird Party Advisory
- http://seclists.org/oss-sec/2015/q3/237Mailing List, Third Party Advisory
- http://seclists.org/oss-sec/2015/q3/292Mailing List, Third Party Advisory
- http://seclists.org/oss-sec/2015/q3/294Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/76281Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1250352Issue Tracking, Patch, Third Party Advisory
- https://github.com/golang/go/commit/117ddcb83d7f42d6aa72241240af99ded81118e9Issue Tracking, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.