What’s Vulnerable › Vulnerabilities

CVE-2025-66405: Portkey.ai Gateway: Server-Side Request Forgery (SSRF) in Custom Host

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-01 · updated 2026-10-18
• Weakness: CWE-918

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.

Affected products

• Portkey-AI gateway: before 1.14.0 — fixed in 1.14.0

How to fix

Upgrade to a fixed version: Portkey-AI gateway 1.14.0. Check the vendor advisory for mitigations.

References

• https://github.com/Portkey-AI/gateway/commit/b5a7825ba5f4e6918deb32d9969899ce2229a885
• https://github.com/Portkey-AI/gateway/pull/1372
• https://github.com/Portkey-AI/gateway/security/advisories/GHSA-hhh5-2cvx-vmfp

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