CVE-2026-77776

Headroom LLM proxy (v0.29.0 and earlier) trusts the client-supplied x-headroom-user-id header as an authenticated identity without binding it to the caller. The header is read directly in headroom/proxy/handlers/openai.py across chat completion and websocket paths, allowing any client to imperson...

CVE-2026-77775 Headroom Proxy Sends Upstream Requests to a Client-Supplied Base URL Without Address Validation

Headroom's LLM proxy lets a client choose the upstream destination with the x-headroom-base-url request header. resolveopenaiupstreambase in headroom/proxy/handlers/openai.py accepts the header value, requires only that it parse with an http or https scheme and a hostname, and returns it for use ...

CVE-2026-77775

Headroom LLM proxy (headroomlabs-ai/headroom) is vulnerable to SSRF via the x-headroom-base-url request header. The functions _resolve_openai_upstream_base and _select_passthrough_base_url accept any URL with an http/https scheme and hostname without rejecting loopback, link-local, or RFC 1918 de...