cvedb.io
CVE-2025-66565
CRITICAL · CVSS 9.8
EPSS exploitation probability: 0%
Published 2025-12-09T16:18:21.097 · Last modified 2026-06-17T09:57:02.433

Summary

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.

Affected products

gofiber — utils

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.