CVE-2025-66565Published

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 UUI…

Exact source revision recorded 25 Oct 2026 03:17:36 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

nvd · CVE-2025-66565

Published

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.

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-252 · CWE-331 · CWE-338

Original publisher date fields

published: 2025-12-09T16:18:21.097

lastModified: 2026-10-07T20:10:01.970

19 source CPE criteria · context only

cpe:2.3:a:gofiber:utils:*:*:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta1:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta10:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta11:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta12:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta13:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta14:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta2:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta3:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta4:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta5:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta6:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta7:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta8:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:beta9:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:rc1:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:rc2:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:rc3:*:*:*:go:*:*
cpe:2.3:a:gofiber:utils:2.0.0:rc4:*:*:*:go:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 9 Dec 2025 16:18:21 UTC
Source modified: 7 Oct 2026 20:10:01 UTC
Observed here: 25 Oct 2026 03:17:36 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · [email protected] · Secondary · 9.3 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 3.1 · [email protected] · Primary · 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H