What’s Vulnerable › Vulnerabilities

CVE-2022-32148: Exposure of client IP addresses 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

Description

Improper exposure of client IP addresses in net/http before Go 1.17.12 and Go 1.18.4 can be triggered by calling httputil.ReverseProxy.ServeHTTP with a Request.Header map containing a nil value for the X-Forwarded-For header, which causes ReverseProxy to set the client IP as the value of the X-Forwarded-For header.

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/412857
• https://go.dev/issue/53423
• https://go.googlesource.com/go/+/b2cc0fecc2ccd80e6d5d16542cc684f97b3a9c8a
• https://groups.google.com/g/golang-announce/c/nqrv9fbR0zE
• https://pkg.go.dev/vuln/GO-2022-0520
• https://go.dev/cl/412857
• https://go.dev/issue/53423
• https://go.googlesource.com/go/+/b2cc0fecc2ccd80e6d5d16542cc684f97b3a9c8a
• https://groups.google.com/g/golang-announce/c/nqrv9fbR0zE
• https://pkg.go.dev/vuln/GO-2022-0520

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