CVE-2026-102895: GPUStack Improper Authentication Vulnerability
Vulnerability summary
CVE-2026-102895 is a critical (CVSS 9.8) Improper Authentication vulnerability in GPUStack. It is known to be exploited: CISA lists it, first on 09-11-2026. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 46.6% of scored vulnerabilities.
Listed as exploited by CISA (09-11-2026)
Source freshness unavailable
How is this decided?Timeline
- 04-11-2026PublishedVulnerability first disclosed.
- 09-11-2026Added to CISA KEVExploitedGPUStack Improper Authentication Vulnerability
- 10-11-2026Last modifiedVulnerability information updated.
- 12-11-2026CISA remediation dueUpcomingApply mitigations per vendor instructions.
Description
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 metrics
3 scores · 3 sources · 1 version- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · PypiEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.56%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
Known exploited
Compare KEV catalogs
CISA KEVListed- Added
- 09-11-2026
- Federal due date
- 12-11-2026
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
CISA 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. github.com/gpustack/gpustack/security/advisories/GHSA-gj9m-f8ph-pmhr nvd.nist.gov/vuln/detail/CVE-2026-102895
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-287Improper AuthenticationWhen an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
- CWE-290Authentication Bypass by SpoofingThis attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
- CWE-346Origin Validation ErrorThe product does not properly verify that the source of data or communication is valid.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Gpustack1 product
- gpustack< 2.2.0
PyPI1 product
- gpustack< 2.2.0
2 vendors · 2 products
References
7 links- github.com/gpustack/gpustack/security/advisories/GHSA-gj9m-f8ph-pmhrX Refsource CONFIRMMitigationVendor AdvisoryWEB
- github.com/gpustack/gpustack/commit/53f42a6a553542974396d16a4ff6b12bcbedb48dX Refsource MISCPatchWEB
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-102895Government ResourceUS Government ResourceWEB
- github.com/gpustack/gpustackPACKAGE