{"id":"CVE-2026-84301","state":"PUBLISHED","title":"FastGPT safe axios SSRF guard still allows DNS rebinding TOCTOU on protected outbound requests","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.","publishedAt":"2026-09-22T16:50:19.790Z","updatedAt":"2026-09-25T23:45:50.724Z","severity":{"score":6.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["labring FastGPT"],"affected":[{"vendor":"labring","product":"FastGPT","versions":[{"version":"< 4.15.2","status":"affected"}]}],"references":["https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9","https://github.com/labring/FastGPT/pull/7261","https://github.com/labring/FastGPT/commit/0a38565c9d1f790045636bd9d55f8d2296c938c7","https://github.com/labring/FastGPT/releases/tag/v4.15.2"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/84xxx/CVE-2026-84301.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-84301","state":"PUBLISHED","datePublished":"2026-09-22T16:50:19.790Z","dateUpdated":"2026-09-25T23:45:50.724Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-09-01T16:17:43.078Z"},"containers":{"cna":{"title":"FastGPT safe axios SSRF guard still allows DNS rebinding TOCTOU on protected outbound requests","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"labring","product":"FastGPT","versions":[{"version":"< 4.15.2","status":"affected"}]}],"references":[{"url":"https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9","name":"https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/labring/FastGPT/pull/7261","name":"https://github.com/labring/FastGPT/pull/7261","tags":["x_refsource_MISC"]},{"url":"https://github.com/labring/FastGPT/commit/0a38565c9d1f790045636bd9d55f8d2296c938c7","name":"https://github.com/labring/FastGPT/commit/0a38565c9d1f790045636bd9d55f8d2296c938c7","tags":["x_refsource_MISC"]},{"url":"https://github.com/labring/FastGPT/releases/tag/v4.15.2","name":"https://github.com/labring/FastGPT/releases/tag/v4.15.2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-22T16:50:19.790Z"},"source":{"advisory":"GHSA-6jwp-qf29-hpj9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-25T23:45:14.745715Z","id":"CVE-2026-84301","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-25T23:45:50.724Z"}}]}}}