CVSS 4.0
9.2 criticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:NCVE-2025-66630
Critical (9.2) in gofiber fiber. EPSS 0.5% chance of exploitation in the next 30 days. Fixed in github.com/gofiber/fiber/v2 2.52.11.
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.
Severity
CVSS 3.1
9.4 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-31)
- CWE
- CWE-338
- Published
- Modified
- Record from
- the NVD, synced
Affected
- gofiber:fiber
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-68rr-p4fp-j59v | Go | github.com/gofiber/fiber/v2 | <2.52.11 | 2.52.11 |
| GO-2026-4471 | Go | github.com/gofiber/fiber | all versions | no fix published |
| GO-2026-4471 | Go | github.com/gofiber/fiber/v2 | <2.52.11 | 2.52.11 |