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.
References (5)
Core 5
Core References
Patch
https://go.dev/cl/412857
Exploit, Issue Tracking, Third Party Advisory
https://go.dev/issue/53423
Mailing List, Patch
https://go.googlesource.com/go/+/b2cc0fecc2ccd80e6d5d16542cc684f97b3a9c8a
Mailing List, Release Notes
https://groups.google.com/g/golang-announce/c/nqrv9fbR0zE
Vendor Advisory
https://pkg.go.dev/vuln/GO-2022-0520
Scores
CVSS v3
6.5
EPSS
0.0006
EPSS Percentile
17.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
Status
published
Products (1)
golang/go
< 1.17.12
Published
Aug 10, 2022
Tracked Since
Feb 18, 2026