CVE-2025-66405

CriticalCVSS 9.8/10Last modified Oct 18, 2026

Description

Portkey.ai Gateway is a blazing fast AI Gateway with integrated guardrails. Prior to 1.14.0, the gateway determined the destination baseURL by prioritizing the value in the x-portkey-custom-host request header. The proxy route then appends the client-specified path to perform an external fetch. This can be maliciously used by users for SSRF attacks. This vulnerability is fixed in 1.14.0.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-918

Affected software

Vendor	Product	Versions
Portkey-AI	gateway	< 1.14.0

References

Timeline

Published: Dec 1, 2025
Last modified: Oct 18, 2026
NVD status: Analyzed

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