CVE-2023-29406

Name: CVE-2023-29406
Creator: NVD / NIST
Published: 2023-07-11T20:15:10.643+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.25%

Last modified Jun 17, 2026

CVE-2023-29406 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 1.25% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS Probability

1.25%

65.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-436

Affected Software

Vendor	Product	Versions
Golang	Go	< 1.19.11
Golang	Go	>= 1.20.0, < 1.20.6

References

https://go.dev/cl/506996Patch
https://go.dev/issue/60374Issue Tracking, Patch
https://groups.google.com/g/golang-announce/c/2q13H6LEEx0Mailing List
https://pkg.go.dev/vuln/GO-2023-1878Vendor Advisory
https://security.gentoo.org/glsa/202311-09
https://security.netapp.com/advisory/ntap-20230814-0002/
https://go.dev/cl/506996Patch
https://go.dev/issue/60374Issue Tracking, Patch
https://groups.google.com/g/golang-announce/c/2q13H6LEEx0Mailing List
https://pkg.go.dev/vuln/GO-2023-1878Vendor Advisory
https://security.gentoo.org/glsa/202311-09
https://security.netapp.com/advisory/ntap-20230814-0002/

Timeline

Published: Jul 11, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-29406?

How severe is CVE-2023-29406?

CVE-2023-29406 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.25% probability of exploitation in the next 30 days.

How do I fix CVE-2023-29406?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-29406?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST