CVE-2026-42344

Published: May 8, 2026Modified: Jul 24, 2026Deferred

6.3

Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Exploitability: 1.8 / Impact: 4.0

Source: security-advisories@github.com (Secondary)

Description

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.

Related CWEs

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.

References (2)

https://github.com/labring/FastGPT/security/advisories/GHSA-cc8x-jrqv-hmwh

Source: security-advisories@github.com

https://github.com/labring/FastGPT/security/advisories/GHSA-cc8x-jrqv-hmwh

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.