CVE-2026-44332

Summary

Fiber is an Express inspired web framework written in Go. Prior to 3.3.0, the default Authorizer function in the BasicAuth middleware in middleware/basicauth/config.go uses short-circuit evaluation that skips password hash comparison for non-existent usernames, enabling reliable remote username enumeration through response timing differences. This issue is fixed in version 3.3.0.

Affected Software

Weaknesses

• CWE-203: CWE-203: Observable Discrepancy

References

• https://github.com/gofiber/fiber/security/advisories/GHSA-g5vh-55hw-rxm8
• https://github.com/gofiber/fiber/pull/4245
• https://github.com/gofiber/fiber/commit/c7ac00edd19f9669b1aebbec6e229658baaa059e
• https://github.com/gofiber/fiber/releases/tag/v3.3.0

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