CVE-2023-29406

Insufficient sanitization of Host header in net/http

MEDIUM
6.5
CVSS Score
Published: July 11, 2023 at 07:23 PM UTC
Updated: June 17, 2026 at 05:49 AM UTC
2 products affected across 2 vendorsGo.NET

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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

The HTTP/1 client does not fully validate the contents of the Host header. A maliciously crafted Host header can inject additional headers or entire requests. With fix, the HTTP/1 client now refuses to send requests containing an invalid Request.Host or Request.URL.Host value.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.19.111.20.0 ≤ v < 1.20.6
Affected range stops below 1.19.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.20.6, so it looks safe — our inference, not a vendor statement
v < 1.19.111.20.0-0 ≤ v < 1.20.61.20.0-0
Affected range stops below 1.19.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.20.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-436

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