Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-66565
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-09 16:18:21 UTC
Updated2026-10-07 20:10:01 UTC
DescriptionFiber 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.

Risk And Classification

Primary CVSS: v4.0 9.3 CRITICAL from [email protected]

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

EPSS: 0.004680000 probability, percentile 0.385110000 (date 2026-10-07)

Problem Types: CWE-252 | CWE-331 | CWE-338 | CWE-252 CWE-252: Unchecked Return Value | CWE-331 CWE-331: Insufficient Entropy | CWE-338 CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary9.3CRITICALCVSS: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/C...
4.0CNADECLARED9.3CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Gofiber Utils 2.0.0 beta1 All All
Application Gofiber Utils 2.0.0 beta10 All All
Application Gofiber Utils 2.0.0 beta11 All All
Application Gofiber Utils 2.0.0 beta12 All All
Application Gofiber Utils 2.0.0 beta13 All All
Application Gofiber Utils 2.0.0 beta14 All All
Application Gofiber Utils 2.0.0 beta2 All All
Application Gofiber Utils 2.0.0 beta3 All All
Application Gofiber Utils 2.0.0 beta4 All All
Application Gofiber Utils 2.0.0 beta5 All All
Application Gofiber Utils 2.0.0 beta6 All All
Application Gofiber Utils 2.0.0 beta7 All All
Application Gofiber Utils 2.0.0 beta8 All All
Application Gofiber Utils 2.0.0 beta9 All All
Application Gofiber Utils 2.0.0 rc1 All All
Application Gofiber Utils 2.0.0 rc2 All All
Application Gofiber Utils 2.0.0 rc3 All All
Application Gofiber Utils 2.0.0 rc4 All All
Application Gofiber Utils All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gofiber Utils affected github.com/gofiber/utils <= 1.2.0 Not specified
CNA Gofiber Utils affected github.com/gofiber/utils/v2 < 2.0.0-rc.4 Not specified

References

ReferenceSourceLinkTags
github.com/gofiber/utils/security/advisories/GHSA-m98w-cqp3-qcqr 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Vendor Advisory
github.com/gofiber/utils/commit/6c6cf047032b9c8dff43d29f990b4b10e9b02d47 [email protected] github.com Patch
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