CVE-2025-66565

CRITICAL EPSS 32.0%
Published Dec 9, 20256mo ago · Modified Jun 17, 20262w ago
9.3 CVSS 4.0
Critical
Find Similar
Published Dec 9, 2025 6mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
32.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 3

CWE-252
CWE-331
CWE-338

Affected Products 19

VendorProductVersionRange
gofiberutils* ≤1.2.0
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any
gofiberutils2.0.0any

References 2

  • github.com https://github.com/gofiber/utils/commit/6c6cf047032b9c8dff43d29f990b4b10e9b02d47
    Patch
  • github.com https://github.com/gofiber/utils/security/advisories/GHSA-m98w-cqp3-qcqr
    Vendor Advisory

Remediation

  • github.com https://github.com/gofiber/utils/commit/6c6cf047032b9c8dff43d29f990b4b10e9b02d47
    Patch