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CVE-2026-44332— Fiber: Username Enumeration via Timing Oracle in BasicAuth Default Authorizer

CVSS 5.3 · Medium EPSS 0.41% · P34

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProductVersion RangeStatus
gofiberfiber< 3.3.0affected
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I. Basic Information for CVE-2026-44332

Vulnerability Information
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Vulnerability Title
Fiber: Username Enumeration via Timing Oracle in BasicAuth Default Authorizer
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Fiber 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fiber Fiber是Fiber团队的一款开发框架。 Fiber 3.3.0之前版本存在侧信道信息泄露漏洞，该漏洞源于BasicAuth中间件的默认Authorizer函数使用短路求值，跳过了对不存在用户名密码哈希比较，可能导致攻击者通过响应时间差异进行远程用户名枚举。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
gofiberfiber < 3.3.0 -

II. Public POCs for CVE-2026-44332

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III. Intelligence Information for CVE-2026-44332

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Patches & Fixes for CVE-2026-44332 (3)

Vendor Advisories for CVE-2026-44332 (1)

Same Patch Batch · gofiber · 2026-07-08 · 3 CVEs total

CVE-2026-450455.3 MEDIUMFiber: X-Real-IP Spoofing via Header.Add() in BalancerForward
CVE-2026-536244.8 MEDIUMFiber: HSTS header never set in helmet middleware due to incorrect protocol check

IV. Related Vulnerabilities

Same product: fiber
Same vendor: gofiber
Same weakness: CWE-203

V. Comments for CVE-2026-44332

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