CVE-2025-66565CRITICAL 9.8EPSS p31.8%

CVE-2025-66565CVE-2025-66565

Description

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.40% probability of exploitation · percentile 31.8% · 2026-06-19T12:03:05Z
Published2025-12-09
Last modified2025-12-11

Underlying weaknesses· 3

CWE-252CWE-331CWE-338

References

  1. https://github.com/gofiber/utils/commit/6c6cf047032b9c8dff43d29f990b4b10e9b02d47
  2. https://github.com/gofiber/utils/security/advisories/GHSA-m98w-cqp3-qcqr
  3. https://github.com/gofiber/utils/security/advisories/GHSA-m98w-cqp3-qcqr

3

TypeTargetConfidenceTier
WeaknessUnchecked Return Valuecwe-2520%live
WeaknessInsufficient Entropycwe-3310%live
WeaknessUse of Cryptographically Weak Pseudo-Random Number Generator (PRNG)cwe-3380%live

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