🛡️ CVE-2025-66630
🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-338 NVD
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Fiber is an Express inspired web framework written in Go. Before 2.52.11, on Go versions prior to 1.24, the underlying crypto/rand implementation can return an error if secure randomness cannot be obtained. Because no error is returned by the Fiber v2 UUID functions, application code may unknowingly rely on predictable, repeated, or low-entropy identifiers in security-critical pathways. This is especially impactful because many Fiber v2 middleware components (session middleware, CSRF, rate limiting, request-ID generation, etc.) default to using utils.UUIDv4(). This vulnerability is fixed in 2.52.11.

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
CWE CWE-338
Public Exploit ✅ No
Source NVD
Published 2026-02-09
Updated 2026-06-15
Modified 2026-02-28

Affected Packages

Software From version Fixed in
fiber — 2.52.11
github.com/gofiber/fiber — —
github.com/gofiber/fiber/v2 — —

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