CVE-2026-102895
Critical9.8CISA KEV — exploited in the wildGPUStack: Authentication bypass via trusted loopback source (reverse-proxy TCP peer or X-GPUStack-Real-IP header) grants unauthenticated admintitle from the CVE record
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.
- CVSS
- 9.8v3.1
- EPSS (exploit probability)
- 0.6%47th pct
- CISA KEV
- Listed
EPSS trendFIRST daily scores, last 90 days
Daily values
| Score date | EPSS | Percentile |
|---|---|---|
| 2026-11-10 | 0.6% | 46.7% |
| 2026-11-09 | 0.3% | 26.5% |
| 2026-11-08 | 0.3% | 26.4% |
| 2026-11-07 | 0.3% | 26.4% |
| 2026-11-06 | 0.3% | 26.4% |
| 2026-11-05 | 0.3% | 26.4% |
CISA KEV entrycatalogue 2026.11.10
- Date added
- 2026-11-09
- Federal due date
- 2026-11-12
- Known ransomware use
- Unknown
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Verbatim from the CISA KEV catalogue (CISA KEV, fetched 2026-11-11 15:43 UTC). The due date applies to US federal agencies under BOD 22-01.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Learn
Why it happened and what stops it
The weakness (CWE)
- CWE-287Improper AuthenticationThe system doesn't properly prove who a user is, so attackers get in as someone else.
- CWE-290Authentication Bypass by SpoofingThe system trusts something an attacker can fake, such as a source address or header.
- CWE-346Origin Validation ErrorThe software doesn't verify where a message really came from, so forged messages are trusted.
How attackers use it (ATT&CK)
Typical for this kind of weakness across CISA KEV exploits (CTID), not specific to this CVE.
How it's exploited
What the attacker gets
Controls that mitigate it (NIST SP 800-53)
- AC-2Account ManagementAccess Control · mitigates 8 of these techniques
- AC-6Least PrivilegeAccess Control · mitigates 8 of these techniques
- CM-6Configuration SettingsConfiguration Management · mitigates 8 of these techniques
- SI-4System MonitoringSystem and Information Integrity · mitigates 8 of these techniques
- AC-3Access EnforcementAccess Control · mitigates 7 of these techniques
- AC-5Separation of DutiesAccess Control · mitigates 7 of these techniques
Affected products
- gpustack gpustack
Coverage1 article
References
- https://github.com/gpustack/gpustack/commit/53f42a6a553542974396d16a4ff6b12bcbedb48d
- https://github.com/gpustack/gpustack/pull/5346
- https://github.com/gpustack/gpustack/releases/tag/v2.2.0
- https://github.com/gpustack/gpustack/security/advisories/GHSA-gj9m-f8ph-pmhr
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-102895