medium5.3
CVE-2026-44332
GoFiber Vulnerable to Username Enumeration via Timing Oracle in BasicAuth Default Authorizer
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/gofiber/fiber/v3 | <= 3.2.0 | 3.3.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Gofiber | Fiber | before 3.3.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-g5vh-55hw-rxm8
- https://github.com/gofiber/fiber/security/advisories/GHSA-g5vh-55hw-rxm8
- https://github.com/gofiber/fiber/commit/c7ac00edd19f9669b1aebbec6e229658baaa059e
- https://github.com/gofiber/fiber/pull/4245
- https://github.com/gofiber/fiber/releases/tag/v3.3.0