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CVE-2025-66565

9.8
CRITICALCVSS v3.1 Base Score
0.08%
LOW RiskEPSS (24th percentile)

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.

Published: 12/9/2025
Modified: 12/11/2025
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Vulnerability Summary

CVSS v3 Score

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score (Exploitation Probability)

0.08%LOW Exploitation Risk
24th percentile

This vulnerability has a 0.08% probability of being exploited in the next 30 days, ranking higher than 24% of all scored CVEs.

CWE Classification

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Same Weakness Type(CWE-252, CWE-331...)

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