CVE-2025-66630

CRITICAL

9.4

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.

CVE Details

CVSS v3.1 Score9.4

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/9/2026

Last Modified2/28/2026

Sourcenvd

Honeypot Sightings0

Affected Products

gofiber:fibergolang:go

Weaknesses (CWE)

CWE-338

References

https://github.com/gofiber/fiber/commit/eb874b6f6c5896b968d9b0ab2b56ac7052cb0ee1(security-advisories@github.com)

https://github.com/gofiber/fiber/releases/tag/v2.52.11(security-advisories@github.com)

https://github.com/gofiber/fiber/security/advisories/GHSA-68rr-p4fp-j59v(security-advisories@github.com)

IOC Correlations

No correlations recorded

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