Bug 2498203 (CVE-2026-44332)

Summary: CVE-2026-44332 github.com/gofiber/fiber: GoFiber: Remote Username Enumeration via BasicAuth Middleware Short-Circuit Evaluation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the GoFiber web framework. A remote attacker could exploit a vulnerability in the default Authorizer function of the BasicAuth middleware. This flaw, caused by short-circuit evaluation, allows for reliable remote username enumeration through differences in response timing. This could lead to information disclosure, potentially aiding further attacks.
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Bug Depends On: 2498502    
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Description OSIDB Bzimport 2026-07-08 20:02:05 UTC 
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.