CVE-2026-44332

Description

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.

PUBLISHED Reserved 2026-05-05 | Published 2026-07-08 | Updated 2026-07-09 | Assigner GitHub_M

Problem types

CWE-203: Observable Discrepancy

Product status

References

github.com/.../fiber/security/advisories/GHSA-g5vh-55hw-rxm8

github.com/gofiber/fiber/pull/4245

github.com/...ommit/c7ac00edd19f9669b1aebbec6e229658baaa059e

github.com/gofiber/fiber/releases/tag/v3.3.0

cve.org (CVE-2026-44332)

nvd.nist.gov (CVE-2026-44332)

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