# CVE-2026-102895: GPUStack: Authentication bypass via trusted loopback source (reverse-proxy TCP peer or X-GPUStack-Real-IP header) grants unauthenticated admin

Status: published. Published: 2026-11-04. Updated: 2026-11-06.

GPUStack is an open-source GPU cluster manager for AI model serving and GPU instance provisioning. Prior to 2.2.0, get_current_user in gpustack/api/auth.py treated a loopback request source as the built-in administrator when force_auth_localhost was false, which was the default. A remote request could appear to originate from 127.0.0.1 because client_ip_getter accepted a same-host reverse proxy peer or a client-supplied X-GPUStack-Real-IP loopback value. The bypass allowed unauthenticated administrative access, including user and model changes, persistent administrator API-key creation, disclosure of worker and cloud-provider secrets, and code execution through POST /v2/inference-backends/from-yaml. Exploitation was observed in the wild against a 2.1.1 deployment. This issue is fixed in version 2.2.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- gpustack / gpustack: < 2.2.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: GitHub_M

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.33% as of 2026-11-05; percentile 26.40%

- SSVC: exploitation none; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-287, CWE-290, CWE-346

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/gpustack/gpustack/security/advisories/GHSA-gj9m-f8ph-pmhr (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/gpustack/gpustack/pull/5346 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/gpustack/gpustack/commit/53f42a6a553542974396d16a4ff6b12bcbedb48d (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/gpustack/gpustack/releases/tag/v2.2.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/gpustack/gpustack/commit/53f42a6a553542974396d16a4ff6b12bcbedb48d (security-advisories@github.com)

- https://github.com/gpustack/gpustack/pull/5346 (security-advisories@github.com)

- https://github.com/gpustack/gpustack/releases/tag/v2.2.0 (security-advisories@github.com)

- https://github.com/gpustack/gpustack/security/advisories/GHSA-gj9m-f8ph-pmhr (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-102895; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-102895; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-102895; retrieved 2026-11-05; source updated Not reported

Revision: 838c2f98a4200087266d7cb5d3e0dee3f7856a9134dcb8bac1ec34c2bdff26d5

Canonical: https://y2.dev/cve/CVE-2026-102895

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- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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