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CVE-2025-66630

Gofiber Fiber vulnerability

9.4 CRITICALEPSS 0.50%
  1. Published9 Feb 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Affected products

Gofiber Fiber< 2.52.11

Remediation

Fixed in
Gofiber Fiber≥ 2.52.11

References

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Frequently asked

Is CVE-2025-66630 being actively exploited?

CVE-2025-66630 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.50%.

How severe is CVE-2025-66630?

CVE-2025-66630 has a CVSS 3.1 base score of 9.4, rated critical. EPSS estimates a 0.50% probability of exploitation.

Which products are affected by CVE-2025-66630?

Affected products include Gofiber Fiber.

How do I fix CVE-2025-66630?

Upgrade affected software to a fixed version, for example Gofiber Fiber 2.52.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66630 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.