{"id":"CVE-2026-84301","published":"2026-09-22T17:17:26.860","lastModified":"2026-09-26T00:16:37.243","description":"FastGPT is an open-source LLM platform for building AI applications on a knowledge base. Prior to 4.15.2, the safe Axios request interceptor in packages/service/common/api/axios.ts validates a hostname with isInternalAddress() before a later HTTP connection performs an independent DNS lookup, creating a DNS rebinding window, allowing an attacker-controlled hostname to resolve publicly during the check and to a loopback, private, link-local, or metadata address during connection. An authenticated attacker who can supply a URL to a safe-Axios-backed HTTP tool, workflow HTTP node, external file fetch, or other server-side integration can use this time-of-check/time-of-use gap to reach services that direct private-address inputs would block. The same independent re-resolution occurs after manual redirect hops because each redirect target is checked before a separate connection lookup. This issue is fixed in version 4.15.2.","cvssScore":6.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","cwes":["CWE-918"],"vendors":[],"products":[],"references":[{"url":"https://github.com/labring/FastGPT/commit/0a38565c9d1f790045636bd9d55f8d2296c938c7","tags":[]},{"url":"https://github.com/labring/FastGPT/pull/7261","tags":[]},{"url":"https://github.com/labring/FastGPT/releases/tag/v4.15.2","tags":[]},{"url":"https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9","tags":[]},{"url":"https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9","tags":[]}],"exploitRefs":[{"url":"https://github.com/labring/FastGPT/commit/0a38565c9d1f790045636bd9d55f8d2296c938c7","tags":[]},{"url":"https://github.com/labring/FastGPT/pull/7261","tags":[]},{"url":"https://github.com/labring/FastGPT/releases/tag/v4.15.2","tags":[]},{"url":"https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9","tags":[]},{"url":"https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9","tags":[]}],"hasPoc":true,"ai":null}