CVE-2026-42344: FastGPT is an AI Agent building platform. In versions 4.14.11 and prior, FastGPT's isInternalAddress() function in packages/service/common/system/utils.ts is…

PriorityP336medium6.3CVSS 3.1

AVNACHPRLUINSCCHINAN

EPSS

0.15%

4.4th percentile

FastGPT is an AI Agent building platform. In versions 4.14.11 and prior, FastGPT's isInternalAddress() function in packages/service/common/system/utils.ts is vulnerable to DNS rebinding (TOCTOU — Time-of-Check to Time-of-Use). The function resolves the hostname via dns.resolve4()/dns.resolve6() and checks resolved IPs against private ranges, but the actual HTTP request happens in a separate call with a new DNS resolution, allowing the DNS record to change between validation and fetch. At time of publication, there are no publicly available patches.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
labring	fastgpt	<= 4.14.11	—

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