What’s Vulnerable › Vulnerabilities

CVE-2022-1705: Improper sanitization of Transfer-Encoding headers in net/http

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-08-10 · updated 2026-06-17
• Weakness: CWE-444

Description

Acceptance of some invalid Transfer-Encoding headers in the HTTP/1 client in net/http before Go 1.17.12 and Go 1.18.4 allows HTTP request smuggling if combined with an intermediate server that also improperly fails to reject the header as invalid.

Affected products

• Go: before 1.17.12; from 1.18.0 before 1.18.4 — fixed in 1.17.12, 1.18.4

How to fix

Upgrade to a fixed version: Go 1.17.12, 1.18.4. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/409874
• https://go.dev/cl/410714
• https://go.dev/issue/53188
• https://go.googlesource.com/go/+/e5017a93fcde94f09836200bca55324af037ee5f
• https://groups.google.com/g/golang-announce/c/nqrv9fbR0zE
• https://pkg.go.dev/vuln/GO-2022-0525
• https://go.dev/cl/409874
• https://go.dev/cl/410714
• https://go.dev/issue/53188
• https://go.googlesource.com/go/+/e5017a93fcde94f09836200bca55324af037ee5f
• https://groups.google.com/g/golang-announce/c/nqrv9fbR0zE
• https://pkg.go.dev/vuln/GO-2022-0525

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