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 UUID values, including the zero UUID "00000000-0000-0000-0000-000000000000". The vulnerability occurs through two related but distinct failure paths, both ultimately caused by crypto/rand.Read() failures, compromising the security of all Fiber applications using these functions for security-critical operations. This issue is fixed in version 2.0.0-rc.4.
EPSS: 0.004 (34.3th 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.