critical
CVE-2025-66565
Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GHSA9.2CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Trivy's own label is CRITICAL. Rated critical by NVD, GHSA.
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.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| go::GitHub Security Advisory Go | github.com/gofiber/utils, github.com/gofiber/utils/v2 | 1.2.0 and 1 more |
Show all 2 entries from 1 source
| Source | Package | Fixed in |
|---|---|---|
| go::GitHub Security Advisory Go | github.com/gofiber/utils | 1.2.0 |
| go::GitHub Security Advisory Go | github.com/gofiber/utils/v2 | 2.0.0-rc.4 |