A critical vulnerability, CVE-2025-66565, has been identified in github.com/gofiber/utils/v2. The library’s UUIDv4 and generic UUID generation functions contain a silent fallback mechanism that can result in the production of predictable UUID values instead of cryptographically strong random ones. This predictability compromises the security guarantees typically associated with UUIDs, potentially enabling attackers to guess or predict identifiers. This could lead to various security bypasses, including session hijacking, token forging, or collision attacks, depending on how UUIDs are utilized within an application. Applications relying on the gofiber/utils/v2 library for security-sensitive unique identifiers are at significant risk.

Technical Details#

  • CVE ID: CVE-2025-66565
  • Published: 2025-12-10 11:09 UTC
  • Product: github.com/gofiber/utils/v2
  • Risk Score: 5.3/10
  • Severity: CRITICAL
  • Original Source: View on Google_OSV

Remediation#

Organizations and developers using github.com/gofiber/utils/v2 are advised to update to the latest patched version as soon as it becomes available. Regularly monitor the official gofiber/utils repository for security advisories and releases. Until a patch is applied, applications should review their usage of UUIDs generated by this library. For security-critical contexts where unpredictability is paramount (e.g., session tokens, CSRF tokens, unique IDs in sensitive data), consider temporarily implementing an alternative, cryptographically secure random UUID generator from a trusted library. After updating, audit all security-related features that depend on UUIDs from this library to ensure no compromise occurred prior to remediation.

Disclaimer: This summary was generated by an Artificial Intelligence system and has not been verified by a human expert. Use at your own risk.

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