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No exploitation reportedFix available

CVE-2015-5739

No exploitation reported by the sources we read.

  • Published2017-10-18
  • WeaknessCWE-444

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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."

Timeline

dates in UTC
  1. 2017-10-1820:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2015-5739?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-5739?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Redhat enterprise linux server eus
BranchAffectedFixed in
7.2= 7.2no fix published
7.3= 7.3no fix published
7.4= 7.4no fix published
7.5= 7.5no fix published
7.6= 7.6no fix published
Redhat enterprise linux server aus
BranchAffectedFixed in
7.2= 7.2no fix published
7.3= 7.3no fix published
7.4= 7.4no fix published
7.6= 7.6no fix published
Redhat enterprise linux server tus
BranchAffectedFixed in
7.2= 7.2no fix published
7.3= 7.3no fix published
7.6= 7.6no fix published

3 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.09.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • NVDweakness (CWE)CWE-444read 2026-10-23
  • FIRST EPSSEPSS score9.6 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2017-10-18
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is 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" instead of "Content-Length."

Is CVE-2015-5739 actively exploited?

Active exploitation of CVE-2015-5739 has not been confirmed. Its EPSS score was 9.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2015-5739?

CVE-2015-5739 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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