CVE-2025-66565

Dec. 9, 2025, 6:36 p.m.

9.3
Critical

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.

Product(s) Impacted

Vendor Product Versions
Fiber
  • Fiber Utils
  • 2.0.0-rc.3, 2.0.0-rc.4

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-252
Unchecked Return Value
The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a fiber fiber_utils 2.0.0-rc.3 / / / / / / /
a fiber fiber_utils 2.0.0-rc.4 / / / / / / /

References

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

Tags

security-advisories@github.com
CWE-252
2025-12-09
CVE-2025-66565

CVSS Score

9.3 / 10

CVSS Data - 4.0

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Attack Requirements: NONE
  • Privileges Required: NONE
  • User Interaction: NONE
  • Scope:
  • Confidentiality Impact: HIGH
  • Integrity Impact: HIGH
  • Availability Impact: LOW
  • Exploit Maturity: NOT_DEFINED

    • 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

    View Vector String

Timeline

Published: Dec. 9, 2025, 4:18 p.m.
Last Modified: Dec. 9, 2025, 6:36 p.m.

Status : Awaiting Analysis

CVE has been marked for Analysis. Normally once in this state the CVE will be analyzed by NVD staff within 24 hours.

More info

Source

security-advisories@github.com

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.