CVE-2026-84301

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: MEDIUM
CVSS score: 6.3 / 10
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Effective score: 6.3 / 10 MEDIUM source: CNA overview
CWE(s): CWE-918
Reserved: 2026-09-01
Published: 2026-09-22 16:50 UTC
Last updated: 2026-09-22 16:50 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/84xxx/CVE-2026-84301.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-22 17:17:26 UTC
NVD last modified: 2026-09-22 17:17:26 UTC
NVD CVSS v3.1: 6.3 / 10 MEDIUM source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Exploitability subscore: 1.8 / 10
Impact subscore: 4.0 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84559
Assigner: GitHub_M
Published: Sep 22, 2026, 4:50:19 PM
Updated: Sep 22, 2026, 4:50:19 PM
EUVD base score (CVSS 3.1): 6.3 / 10
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
EUVD-reported EPSS: 0.0000
Vendors: labring
Products: FastGPT (< 4.15.2)

ENISA 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.

EUVD references (4)

Affected products (1)

Vendor	Product	Versions	Platforms
labring	FastGPT	`< 4.15.2` (affected)	—

Vendor references (4)

References embedded in the original CVE record by the assigning CNA.

https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9 x_refsource_CONFIRM
https://github.com/labring/FastGPT/pull/7261 x_refsource_MISC
https://github.com/labring/FastGPT/commit/0a38565c9d1f790045636bd9d55f8d2296c938c7 x_refsource_MISC
https://github.com/labring/FastGPT/releases/tag/v4.15.2 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (4)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/labring/FastGPT/commit/0a38565c9d1f790045636bd9d55f8d2296c938c7 security-advisories@github.com
https://github.com/labring/FastGPT/pull/7261 security-advisories@github.com
https://github.com/labring/FastGPT/releases/tag/v4.15.2 security-advisories@github.com
https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9 security-advisories@github.com

Remediations (10)

CVE-2026-84301 - Exploits & Severity - Feedly

web:feedly.com

First article Feedly found the first article mentioning CVE-2026-84301 . See article

2026-09-23 15:43 UTC
Security Advisories and Bulletins | Microsoft Learn

web:learn.microsoft.com

In this library you will find the following security documents that have been released by the Microsoft Security Response Center (MSRC). The MSRC investigates all reports of security vulnerabilities affecting Microsoft products and services, and releases these documents as part of the ongoing effort to help you manage security risks and help keep your systems protected. Please use the ...

2026-09-23 15:43 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-23 15:43 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-09-23 15:43 UTC
Cisco Advance Notification for Publication of September 16, 2026 ...

web:sec.cloudapps.cisco.com

On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

2026-09-23 15:43 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:43 UTC
Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days

web:www.bleepingcomputer.com

Today is Microsoft's August 2026 Patch Tuesday, and with it comes security updates for a massive 400 flaws, including one actively exploited and two publicly disclosed zero-day vulnerabilities.

2026-09-23 15:43 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:43 UTC
CVE-2026-84301: labring FastGPT: FastGPT is an open-source LLM ... - Rapid7

web:www.rapid7.com

CVE-2026-84301 : labring FastGPT: FastGPT is an open-source LLM platform for building AI applications on a knowledge base. View severity, references, and remediation details from Rapid7.

2026-09-23 15:43 UTC
Patch Tuesday September 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's September 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-09-23 15:43 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-84301.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "FastGPT",
          "vendor": "labring",
          "versions": [
            {
              "status": "affected",
              "version": "< 4.15.2"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "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",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T16:50:19.790Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/labring/FastGPT/security/advisories/GHSA-6jwp-qf29-hpj9"
        },
        {
          "name": "https://github.com/labring/FastGPT/pull/7261",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/labring/FastGPT/pull/7261"
        },
        {
          "name": "https://github.com/labring/FastGPT/commit/0a38565c9d1f790045636bd9d55f8d2296c938c7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/labring/FastGPT/commit/0a38565c9d1f790045636bd9d55f8d2296c938c7"
        },
        {
          "name": "https://github.com/labring/FastGPT/releases/tag/v4.15.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/labring/FastGPT/releases/tag/v4.15.2"
        }
      ],
      "source": {
        "advisory": "GHSA-6jwp-qf29-hpj9",
        "discovery": "UNKNOWN"
      },
      "title": "FastGPT safe axios SSRF guard still allows DNS rebinding TOCTOU on protected outbound requests"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-84301",
    "datePublished": "2026-09-22T16:50:19.790Z",
    "dateReserved": "2026-09-01T16:17:43.078Z",
    "dateUpdated": "2026-09-22T16:50:19.790Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}