Executive Summary

This vulnerability exists in the Fiber web framework, which is written in Go. Before version 2.52.11, on Go versions prior to 1.24, the crypto/rand package can return an error if it fails to obtain secure randomness. However, Fiber's UUID functions do not return this error, causing the application to unknowingly use predictable, repeated, or low-entropy UUIDs. Since many Fiber middleware components rely on these UUIDs for security-critical functions like sessions, CSRF protection, rate limiting, and request ID generation, this flaw can compromise security.

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Detection Guidance

I don't know

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Compliance Impact

I don't know

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Impact Analysis

The impact of this vulnerability is that security-critical identifiers generated by Fiber may be predictable or repeated due to low-entropy UUIDs. This can lead to potential security risks such as session hijacking, bypassing CSRF protections, ineffective rate limiting, and compromised request tracking. Essentially, attackers could exploit these predictable identifiers to impersonate users or disrupt application security mechanisms.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade the Fiber web framework to version 2.52.11 or later.

Additionally, ensure that your Go runtime version is 1.24 or later to avoid issues with the underlying crypto/rand implementation.

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