CVE-2026-44332

Published: Jul 8, 2026Modified: Jul 15, 2026

5.3

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitability: 3.9 / Impact: 1.4

Source: security-advisories@github.com (Secondary)

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.

Affected (1)

Products: Gofiber: Fiber

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Gofiber Fiber	Before 3.3.0

Related CWEs

Observable Discrepancy

The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.

References (4)

https://github.com/gofiber/fiber/commit/c7ac00edd19f9669b1aebbec6e229658baaa059e

Source: security-advisories@github.com

Patch

https://github.com/gofiber/fiber/pull/4245

Source: security-advisories@github.com

Issue TrackingPatch

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

Source: security-advisories@github.com

Release Notes

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

Source: security-advisories@github.com

ExploitVendor Advisory

Timeline

No history available yet.