CVE-2026-42344Public exploitNetwork attack vector

Authenticated SSRF via DNS rebinding TOCTOU

Published May 8, 2026 · Updated May 8, 2026

SSRF in FastGPT 4.14.11 and earlier allows remote authenticated users to read internal resources through DNS rebinding. The isInternalAddress() function in packages/service/common/system/utils.ts validates one DNS answer, while the later HTTP client resolves the same hostname again and can receive a private address. Exploitation requires low-privileged access and control of DNS responses; successful requests can read cloud metadata or other reachable internal services.

CVSS severity6.3
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in FastGPT 4.14.11 and earlier allows remote authenticated users to read internal resources through DNS rebinding. The isInternalAddress() function in packages/service/common/system/utils.ts validates one DNS answer, while the later HTTP client resolves the same hostname again and can receive a private address. Exploitation requires low-privileged access and control of DNS responses; successful requests can read cloud metadata or other reachable internal services.

The record

CVE
CVE-2026-42344
Published
May 8, 2026
Updated
May 8, 2026
Vendor
Labring
Product
FastGPT
Classifications
CWE-367, T1552.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 4.14.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Labring · FastGPTversion=<= 4.14.11

Published CVSS scores

6.3GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1552.005Cloud Instance Metadata API

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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