01 Record

CVE-2026-77776

Headroom Proxy Treats the Client-Supplied x-headroom-user-id Header as an Authenticated Identity

CriticalPUBLISHEDCNA: VulnCheck

Base score9.3 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

02 Description

Headroom Proxy Treats the Client-Supplied x-headroom-user-id Header as an Authenticated Identity

Published

2026-08-21 11:22Z14 HR AGO

Last updated

2026-08-21 21:44Z3 HR AGO

Reserved

2026-08-21

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CVSS vector

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

Weaknesses

SSVC decision

ExploitationnoneAutomatableyesTechnical Impacttotal

Data version

5.2

Document digest

ce8daaa8e350611ce85a2e7e36afacd3928e6301ca326d4f57b3cdbad694f4da

VendorProductVersionsPlatforms

Headroom LabsHeadroom0 to < 0.36.1—

github.comPull Request #2207 addressing the assessment findingshttps://github.com/headroomlabs-ai/headroom/pull/2207issue-tracking
github.comHeader handling in the OpenAI proxy handler at v0.29.0https://github.com/headroomlabs-ai/headroom/blob/v0.29.0/headroom/proxy/handlers/openai.pytechnical-description
github.comresolve_memory_identity seam introduced by the fixhttps://github.com/headroomlabs-ai/headroom/blob/v0.36.1/headroom/proxy/identity.pytechnical-description
github.comhttps://github.com/headroomlabs-ai/headroomproduct
www.vulncheck.comVulnCheck Advisory: Headroom Proxy Treats the Client-Supplied x-headroom-user-id Header as an Authenticated Identityhttps://www.vulncheck.com/advisories/headroom-proxy-treats-the-client-supplied-x-headroom-user-id-header-as-an-authenticated-identitythird-party-advisory