Portkey AI Gateway 1.14.0 through 1.15.2 SSRF via x-portkey-custom-host Header

Advisories

Portkey AI Gateway 1.14.0 through 1.15.2 SSRF via x-portkey-custom-host Header

Severity: medium
Date: 10/14/2026
Affecting: gateway >= 1.14.0, <= 1.15.2
CVE: CVE-2026-110719
CWE: CWE-918 Server-Side Request Forgery (SSRF)
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
References: https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/BJypv-aiMg
https://github.com/Portkey-AI/gateway/blob/ca7712947ec8c0887803990b746740d36011c697/src/middlewares/requestValidator/index.ts#L289
https://github.com/Portkey-AI/gateway
Credit: hieuPenguinnn
Description: Portkey AI Gateway 1.14.0 through 1.15.2 contains a server-side request forgery vulnerability that allows unauthenticated attackers to reach loopback and Docker host services because isValidCustomHost trusts localhost-style hosts when TRUSTED_CUSTOM_HOSTS is unset. Attackers can send /v1 requests with a crafted x-portkey-custom-host header, such as via the ollama provider, to make the gateway call internal services and return their responses.

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