Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gofiber | Fiber | < 2.52.11 |
| Golang | Go | < 1.24.0 |
Related Weaknesses (CWE)
References
- https://github.com/gofiber/fiber/commit/eb874b6f6c5896b968d9b0ab2b56ac7052cb0ee1Patch
- https://github.com/gofiber/fiber/releases/tag/v2.52.11ProductRelease Notes
- https://github.com/gofiber/fiber/security/advisories/GHSA-68rr-p4fp-j59vVendor Advisory
FAQ
What is CVE-2025-66630?
CVE-2025-66630 is a vulnerability with a CVSS score of 9.4 (CRITICAL). 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 obt...
How severe is CVE-2025-66630?
CVE-2025-66630 has been rated CRITICAL with a CVSS base score of 9.4/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-66630?
Check the references section above for vendor advisories and patch information. Affected products include: Gofiber Fiber, Golang Go.