CVE-2026-77776
- Source
- https://cve.org/CVERecord?id=CVE-2026-77776
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77776.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-77776
- Published
- 2026-08-21T11:22:51Z
- Modified
- 2026-09-11T03:30:45Z
- Severity
-
- 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Headroom Proxy Treats the Client-Supplied x-headroom-user-id Header as an Authenticated Identity
- Details
-
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.
- Database specific
{ "cna_assigner": "VulnCheck", "cwe_ids": [ "CWE-639" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77776.json" }- References
-
- https://pypi.org
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77776.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-77776
- https://www.vulncheck.com/advisories/headroom-proxy-treats-the-client-supplied-x-headroom-user-id-header-as-an-authenticated-identity
- https://github.com/headroomlabs-ai/headroom/pull/2207
- https://github.com/headroomlabs-ai/headroom
- https://github.com/headroomlabs-ai/headroom/blob/v0.29.0/headroom/proxy/handlers/openai.py
- https://github.com/headroomlabs-ai/headroom/blob/v0.36.1/headroom/proxy/identity.py