CVE-2025-66630

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-66630
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.

9.4 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References
Link Resource
https://github.com/gofiber/fiber/commit/eb874b6f6c5896b968d9b0ab2b56ac7052cb0ee1 Patch
https://github.com/gofiber/fiber/releases/tag/v2.52.11 Product Release Notes
https://github.com/gofiber/fiber/security/advisories/GHSA-68rr-p4fp-j59v Vendor Advisory
Configurations

Configuration 1 (hide)

AND
cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*
cpe:2.3:a:golang:go:*:-:*:*:*:*:*:*
History

28 Feb 2026, 00:26

Type Values Removed Values Added
References () https://github.com/gofiber/fiber/commit/eb874b6f6c5896b968d9b0ab2b56ac7052cb0ee1 - () https://github.com/gofiber/fiber/commit/eb874b6f6c5896b968d9b0ab2b56ac7052cb0ee1 - Patch
References () https://github.com/gofiber/fiber/releases/tag/v2.52.11 - () https://github.com/gofiber/fiber/releases/tag/v2.52.11 - Product, Release Notes
References () https://github.com/gofiber/fiber/security/advisories/GHSA-68rr-p4fp-j59v - () https://github.com/gofiber/fiber/security/advisories/GHSA-68rr-p4fp-j59v - Vendor Advisory
Summary
  • (es) Fiber es un framework web inspirado en Express escrito en Go. Antes de la versión 2.52.11, en versiones de Go anteriores a la 1.24, la implementación subyacente de crypto/rand puede devolver un error si no se puede obtener aleatoriedad segura. Dado que las funciones UUID de Fiber v2 no devuelven ningún error, el código de la aplicación puede depender sin saberlo de identificadores predecibles, repetidos o de baja entropía en rutas críticas para la seguridad. Esto es especialmente impactante porque muchos componentes de middleware de Fiber v2 (middleware de sesión, CSRF, limitación de velocidad, generación de ID de solicitud, etc.) utilizan por defecto utils.UUIDv4(). Esta vulnerabilidad se corrige en la versión 2.52.11.
First Time Gofiber
Golang
Golang go
Gofiber fiber
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.4
CPE cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*
cpe:2.3:a:golang:go:*:-:*:*:*:*:*:*

09 Feb 2026, 18:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-02-09 18:16

Updated : 2026-02-28 00:26

NVD link : CVE-2025-66630

Mitre link : CVE-2025-66630

CVE.ORG link : CVE-2025-66630

JSON object : View

Products Affected

golang

  • go

gofiber

  • fiber
CWE
CWE-338

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)