CVE-2026-44332
Fiber: Username Enumeration via Timing Oracle in BasicAuth Default Authorizer
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jul 8, 2026
- Updated
- Jul 9, 2026
- Reserved
- May 5, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N | GitHub_M |
Weaknesses
- CWE-203 Observable Discrepancy
Affected Products
| Product | Versions |
|---|---|
fibergofiber |
|
References
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