CVE-2025-66565

9.8 CRITICAL
Published: December 09, 2025 Modified: December 11, 2025

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/gofiber/utils/security/advisories/GHSA-m98w-cqp3-qcqr
Source: security-advisories@github.com
Vendor Advisory
https://github.com/gofiber/utils/security/advisories/GHSA-m98w-cqp3-qcqr
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Vendor Advisory

3 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.8 / 10.0
EPSS (Exploit Probability)
0.1%
19th percentile
Exploitation Status
Not in CISA KEV

Affected Vendors

gofiber