CVE-2026-44332 | Fiber is an Express inspired web framework written in Go. Pr… | CVSS 5.3 MEDIUM

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.

Metadata

CVE ID: CVE-2026-44332
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-05 19:52 UTC
Published: 2026-07-08 19:32 UTC
Last updated: 2026-07-09 14:33 UTC
Primary CWE: CWE-203
CWE-203: Observable Discrepancy
Vendor / Product: gofiber / fiber
Sources: cve.org · NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
gofiber	fiber	—	< 3.3.0

Weakness (CWE)

CWE	Source	Description
CWE-203	cna	CWE-203: Observable Discrepancy

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.3	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References (4)

https://github.com/gofiber/fiber/security/advisories/GHSA-g5vh-55hw-rxm8 https://github.com/gofiber/fiber/security/advisories/GHSA-g5vh-55hw-rxm8
https://github.com/gofiber/fiber/pull/4245 https://github.com/gofiber/fiber/pull/4245
https://github.com/gofiber/fiber/commit/c7ac00edd19f9669b1aebbec6e229658baaa059e https://github.com/gofiber/fiber/commit/c7ac00edd19f9669b1aebbec6e229658baaa059e
https://github.com/gofiber/fiber/releases/tag/v3.3.0 https://github.com/gofiber/fiber/releases/tag/v3.3.0