Headroom Labs up to 0.36.0 resolve_memory_identity openai.py x-headroom-user-id privileges management

Summaryinfo

A vulnerability was found in Headroom Labs Headroom up to 0.36.0. It has been rated as critical. The impacted element is an unknown function of the file headroom/proxy/handlers/openai.py of the component resolve_memory_identity. This manipulation of the argument x-headroom-user-id causes privileges management. This vulnerability appears as CVE-2026-77776. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in Headroom Labs Headroom up to 0.36.0. Affected by this vulnerability is an unknown function of the file headroom/proxy/handlers/openai.py of the component resolve_memory_identity. The manipulation of the argument x-headroom-user-id with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-77776 since 08/21/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 0.36.1 eliminates this vulnerability.

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Productinfo

Vendor

• Headroom Labs

Name

• Headroom

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36.0

CPE 2.3info

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CPE 2.2info

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