VYPR
Critical severity9.8NVD Advisory· Published Dec 9, 2025· Updated Jun 17, 2026

CVE-2025-66565

CVE-2025-66565

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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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/gofiber/utils/v2Go
< 2.0.0-rc.42.0.0-rc.4
github.com/gofiber/utilsGo
< 1.2.01.2.0

Affected products

24
  • osv-coords4 versions
    < 0.0.20260723T184607-160000.1.1+ 3 more
    • (no CPE)range: < 0.0.20260723T184607-160000.1.1
    • (no CPE)range: < 2.0.0-rc.4
    • (no CPE)range: < 1.2.0
    • (no CPE)range: < 0.0.20251230T014957-150000.1.134.1
  • Gofiber/Utilscpe-rescue20 versions
    github.com/gofiber/utils <= 1.2.0+ 19 more
    • (no CPE)range: github.com/gofiber/utils <= 1.2.0
    • cpe:2.3:a:gofiber:utils:*:*:*:*:*:go:*:*range: <=1.2.0
    • 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:*:*

Patches

Vulnerability mechanics

References

4

News mentions

0

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