CVE-2026-42344

6.3 mediumEPSS 0.1%

Medium (6.3). EPSS 0.1% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.3 medium

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

EPSS: 0.1% chance of exploitation in the next 30 days; higher than 3% of CVEs (scores of 2026-10-31)
CWE: CWE-367
Published: 2026-05-08
Modified: 2026-07-24
Record from: the NVD, synced 2026-10-19

References

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

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