What is CVE-2025-66565?

CVE-2025-66565 is a critical-severity vulnerability in Gofiber Utils, classified under CWE-252. CVSS score: 9.8/10. Published 2025-12-09.

How severe is CVE-2025-66565?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Gofiber Utils

CVE-2025-66565

Fiber Utils is a collection of common functions created for Fiber. In versions 2.0.0-rc.3 and below, when the system's cryptographic random number generator (crypto/rand) fails, both functions silently fall back to returning predictable UU…

EPSS: 0.004 (32.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Gofiber Utils — versions github.com/gofiber/utils <= 1.2.0, github.com/gofiber/utils/v2 < 2.0.0-rc.4, 2.0.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2025-66565?: CVE-2025-66565 is a critical-severity vulnerability in Gofiber Utils, classified under CWE-252. CVSS score: 9.8/10. Published 2025-12-09.
How severe is CVE-2025-66565?: Critical severity. CVSS v3 base score is 9.8 out of 10.