CVE-2026-44332 gofiber CVE debrief

Who should care

Users of Fiber versions prior to 3.3.0 should update to the latest version to prevent potential username enumeration attacks. This vulnerability affects operators of web applications using Fiber, platform administrators, and security teams responsible for vulnerability management.

Technical summary

The BasicAuth middleware in Fiber, an Express-inspired web framework written in Go, has a vulnerability that allows for remote username enumeration. The default Authorizer function in middleware/basicauth/config.go uses short-circuit evaluation, which skips password hash comparison for non-existent usernames. This enables attackers to determine if a username exists through response timing differences. The issue was fixed in version 3.3.0.

Defensive priority

Medium

Recommended defensive actions

• Update Fiber to version 3.3.0 or later
• Implement additional authentication and authorization measures
• Monitor for potential enumeration attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-08T20:16:49.773Z and last modified on 2026-07-10T19:01:16.053Z. The NVD entry is currently Undergoing Analysis. Evidence is limited, and defenders should verify affected Fiber deployments and review vendor guidance for updates.

Official resources