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CVE-2026-84301— FastGPT safe axios SSRF guard still allows DNS rebinding TOCTOU on protected outbound requests

Quick assessment

Affected
labring FastGPT
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 pe

CVSS 6.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
labring FastGPT < 4.15.2 affected
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I. Basic Information for CVE-2026-84301

Vulnerability Information

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Vulnerability Title
FastGPT safe axios SSRF guard still allows DNS rebinding TOCTOU on protected outbound requests
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
labring FastGPT < 4.15.2 -

II. Public POCs for CVE-2026-84301

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III. Intelligence Information for CVE-2026-84301

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Patches & Fixes for CVE-2026-84301 (1)

Other References for CVE-2026-84301 (2)

IV. Related Vulnerabilities

Same product: FastGPT
Same vendor: labring
Same weakness: CWE-918

V. Comments for CVE-2026-84301

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