Medium severity · published Jul 11, 2023
CVE-2023-29406
The HTTP/1 client does not fully validate the contents of the Host header
6.5
CVSS
1.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 73% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GO
GO · Golang
before 1.19.11; 1.20.0 before 1.20.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-29406
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-29406
Patch
https://go.dev/cl/506996
Issue Tracking
https://go.dev/issue/60374
Mailing List
https://groups.google.com/g/golang-announce/c/2q13H6LEEx0
Vendor Advisory
https://pkg.go.dev/vuln/GO-2023-1878
security.gentoo.org
https://security.gentoo.org/glsa/202311-09
security.netapp.com
https://security.netapp.com/advisory/ntap-20230814-0002/
More from GO
8.1
CVE-2020-0601
Microsoft Windows CryptoAPI Spoofing Vulnerability
7.5
CVE-2023-44487
HTTP/2 Rapid Reset Attack Vulnerability
10.0
CVE-2025-68121
Unexpected session resumption in crypto/tls
9.8
CVE-2026-27143
Missing bound checks can lead to memory corruption in safe Go in cmd/compile
9.8
CVE-2024-24790
The various Is methods (IsPrivate, IsLoopback, etc) did not work as expected for IPv4-mapped IPv6 addresses, returning false for addresses which would return true in their…