https://www.phllaps.net/tags/gpustack/ Recent content in GPUStack on PhllapsNET Hugo en-gb Mon, 09 Nov 2026 00:00:00 +0000 https://www.phllaps.net/posts/gpustack-improper-authentication-vulnerability/ Mon, 09 Nov 2026 00:00:00 +0000 https://www.phllaps.net/posts/gpustack-improper-authentication-vulnerability/ <div style="background:#b91c1c;color:white;padding:16px 18px;border-radius:14px;font-weight:800;font-size:18px;display:flex;align-items:center;gap:12px;box-shadow:0 10px 24px rgba(0,0,0,0.18);"><span style="font-size:24px;">🚨</span><span>SEVERITY: CRITICAL — CVSS 9.8</span><span style="opacity:0.95;font-weight:700;margin-left:auto;">Security Advisory</span></div> <h2 id="tldr-">TL;DR 📌</h2> <ul> <li>GPUStack contains an improper authentication vulnerability which could allow 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.</li> <li>Highest CVSS: <strong>9.8 (Critical)</strong>.</li> <li><strong>Listed in CISA KEV</strong> (2026-11-09) — this is being exploited in the wild.</li> <li><strong>Check the advisory for fixed releases</strong> — remediation detail is in the vendor link below.</li> <li>CVEs: CVE-2026-102895.</li> </ul> <h2 id="what-it-is">What it is</h2> <p>CVE-2026-102895 is an authentication bypass in GPUStack, the open-source GPU cluster manager used for AI model serving and GPU instance provisioning. The flaw sits in <code>get_current_user</code> in <code>gpustack/api/auth.py</code>, which treats any request that appears to originate from the loopback address as the built-in administrator. This loopback trust is controlled by <code>force_auth_localhost</code>, which defaults to false.</p>