CVE intelligence and bounded remediation
CVE-2015-5739 — Golang Go security vulnerability
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."
- Severity
- Critical
- CVSS
- 9.8 (3.0)
- Published
- 2017-10-18
- CISA KEV
- Not currently listed
- Ecosystem
- software/application
- Weaknesses
- CWE-444
Affected products
- golang / go
- fedoraproject / fedora / 21
- fedoraproject / fedora / 22
- redhat / enterprise_linux_server / 7.0
- redhat / enterprise_linux_server_aus / 7.2
- redhat / enterprise_linux_server_aus / 7.3
Showing 6 representative product identities from 16 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.
Matched remediation archetype
HTTP request smuggling and message-boundary ambiguity
This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.
Check exposure
- Inventory every proxy, CDN, gateway, load balancer, service mesh, and application server hop on affected request paths.
- Compare documented parsing and normalization behavior for message length, transfer coding, duplicate headers, and protocol translation.
- Identify connection reuse and which downstream services trust headers added by intermediaries.
Remediate safely
- Update affected intermediaries and origin servers and align them on a single standards-compliant request framing policy.
- Reject ambiguous length, transfer-coding, duplicate, malformed, and unsupported framing before forwarding.
- Normalize or remove hop-by-hop and identity headers at one controlled boundary and add multi-hop regression tests.
Authoritative sources
Complete CVE record and remediation plan
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