CVE WatchAug 21, 2026

CVE-2026-77776

Headroom's LLM proxy derives the memory owner from the x-headroom-user-id request header. The header is read directly at several points in h

CVSS

9.1

Critical

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 21, 2026 · Last modified: Aug 21, 2026 · CWE-639

EPSS · 30d

Not enough EPSS history yet.

Technical description

Headroom's LLM proxy derives the memory owner from the x-headroom-user-id request header. The header is read directly at several points in headroom/proxy/handlers/openai.py, including the chat completion and websocket paths, and nothing binds the value to the caller. A client can therefore name another user's identifier and read or write that user's stored LLM memory. The fix introduces a single resolve_memory_identity seam in headroom/proxy/identity.py that honors the header only for loopback or allowlisted callers and otherwise binds the identity to the proxy-token fingerprint or the operating system user. The pip console script binds 127.0.0.1 by default, but the reference docker-compose.yml ships --host 0.0.0.0 with published ports and no required HEADROOM_PROXY_TOKEN, which the server itself warns about at startup, so a deployment following the shipped compose exposes the affected data-plane routes to the network without authentication.

Official references

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CVE-2026-77780—

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