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This could allow an attacker to exfiltrate sensitive data, for instance, by accessing the AWS metadata service.\n\n### Patches\nThe issue is patched in 1.14.0 (https://github.com/Portkey-AI/gateway/pull/1372)\n\nThe vulnerability resides within the gateway's request processing function which handles the `x-portkey-custom-host` header. This parameter was passed directly or with insufficient validation/sanitization to an internal HTTP request function.\n\n**The fix (v1.14.0) implements a robust allow-list policy:**\n\n1. All custom host inputs are now strictly validated to ensure the resulting URI points only to trusted, expected external services.\n\n2. The implementation now explicitly blocks requests to non-routable IP addresses, loopback addresses, private networks and standard metadata endpoints.\n\n### Credit\nThis vulnerability was discovered and reported responsibly by @im-soohyun. We thank them for their adherence to coordinated vulnerability disclosure principles.\n\n### References\nhttps://cwe.mitre.org/data/definitions/918.html","state":0,"publishedAt":"2025-12-02T01:08:37+00:00","modifiedAt":"2025-12-02T01:53:14.002296+00:00","affected":[{"ecosystem":"npm","name":"@portkey-ai/gateway","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.14.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/Portkey-AI/gateway/security/advisories/GHSA-hhh5-2cvx-vmfp","https://nvd.nist.gov/vuln/detail/CVE-2025-66405","https://github.com/Portkey-AI/gateway/pull/1372","https://github.com/Portkey-AI/gateway/commit/b5a7825ba5f4e6918deb32d9969899ce2229a885","https://github.com/Portkey-AI/gateway"],"sourceUrl":"https://github.com/advisories/GHSA-hhh5-2cvx-vmfp","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-hhh5-2cvx-vmfp","identifiers":["GHSA-hhh5-2cvx-vmfp","CVE-2025-66405"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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