CVE-2025-66405CRITICAL 9.8EPSS p22.7%

CVE-2025-66405CVE-2025-66405

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.31% probability of exploitation · percentile 22.7% · 2026-06-18T12:00:27Z
Published2025-12-01
Last modified2026-02-20

Underlying weaknesses· 1

CWE-918

References

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

1

TypeTargetConfidenceTier
WeaknessServer-Side Request Forgery (SSRF)cwe-9180%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.