Unintended Proxy or Intermediary Affecting std/net/http/cgi package, versions <1.6.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-STDNETHTTPCGI-14548633
- published6 Jan 2026
- disclosed9 Aug 2022
- creditDominic Scheirlinck
Introduced: 9 Aug 2022
CVE-2016-5386 (opens in a new tab)How to fix?
Upgrade std/net/http/cgi to version 1.6.3 or higher.
Overview
std/net/http/cgi is a Go standard library package std/net/http/cgi
Affected versions of this package are vulnerable to Unintended Proxy or Intermediary.
Go Vulnerability Report:
An input validation flaw in the CGI components allows the HTTP_PROXY environment variable to be set by the incoming Proxy header, which changes where Go by default proxies all outbound HTTP requests.This environment variable is also used to set the outgoing proxy, enabling an attacker to insert a proxy into outgoing requests of a CGI program.Read more about "httpoxy" here: https://httpoxy.org.