CVE-2025-66405

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

CVSS 6.9 MEDIUMEPSS 0.3%CWE-918

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.9EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

01 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Affected products

Portkey-AI · gateway

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