What is CVE-2026-42344?

CVE-2026-42344 is a medium-severity vulnerability in Labring Fastgpt, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.3/10. Published 2026-05-08.

How severe is CVE-2026-42344?

Medium severity. CVSS v3 base score is 6.3 out of 10.

Vulnerability in Labring Fastgpt

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 vulnerable to DNS rebinding (TOCTOU — Time-of-Check to Time-of-Use). The function…

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

EPSS: 0.000 (9.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Labring Fastgpt — versions <= 4.14.11

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-42344?: CVE-2026-42344 is a medium-severity vulnerability in Labring Fastgpt, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.3/10. Published 2026-05-08.
How severe is CVE-2026-42344?: Medium severity. CVSS v3 base score is 6.3 out of 10.