CVE-2015-5740

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 4%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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 with two Content-length headers.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
88.4%
KEV
Not listed

Published

October 18, 2017

Last Modified

May 13, 2026

Advisory Details (6)

Auto-updated May 15, 2026
Patch available. Sources: redhat.
generic

net/http: harden Server against request smuggling · golang/go@300d9a2 · GitHub

https://github.com/golang/go/commit/300d9a21583e7cf0149a778a0611e76ff7c6680f
redhat Patch Available

1250352 – (CVE-2015-5739, CVE-2015-5740, CVE-2015-5741) CVE-2015-5739 CVE-2015-5740 CVE-2015-5741 golang: HTTP request smuggling in net/http library

https://bugzilla.redhat.com/show_bug.cgi?id=1250352
generic

oss-sec: Re: CVE Request - Go net/http library - HTTP smuggling

http://seclists.org/oss-sec/2015/q3/294
generic

oss-sec: Re: CVE Request - Go net/http library - HTTP smuggling

http://seclists.org/oss-sec/2015/q3/292
generic

oss-sec: CVE Request - Go net/http library - HTTP smuggling

http://seclists.org/oss-sec/2015/q3/237
generic
http://rhn.redhat.com/errata/RHSA-2016-1538.html

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatgolang-0:1.6.3-1.el7_2.12016-08-02redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
stdlib—1.4.3—

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 106 total refreshes for this CVE.

  1. 2026-07-22 21:59 UTCEG score recompute
  2. 2026-07-22 14:04 UTCEPSS rescore
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  62. 2026-05-20 10:03 UTCVendor advisory
  63. 2026-05-20 10:03 UTCGHSA enrichment
  64. 2026-05-20 05:39 UTCVendor advisory
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  66. 2026-05-20 01:15 UTCVendor advisory
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  68. 2026-05-19 20:51 UTCVendor advisory
  69. 2026-05-19 20:51 UTCGHSA enrichment
  70. 2026-05-19 16:27 UTCVendor advisory
  71. 2026-05-19 16:27 UTCGHSA enrichment
  72. 2026-05-19 12:02 UTCVendor advisory
  73. 2026-05-19 12:02 UTCGHSA enrichment
  74. 2026-05-19 07:38 UTCVendor advisory
  75. 2026-05-19 07:38 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2015-5740?
CVE-2015-5740 is a critical vulnerability published on October 18, 2017. 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 with two Content-length headers.
When was CVE-2015-5740 disclosed?
CVE-2015-5740 was first published in the National Vulnerability Database on October 18, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-5740 actively exploited?
CVE-2015-5740 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 88.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-5740?
CVE-2015-5740 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2015-5740?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-5740, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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