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CVE-2026-30246— github.com/gofiber/fiber/v3 cache middleware can mix responses across query parameters

Quick assessment

Affected
gofiber fiber
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fiber是Fiber开源的一款使用Go语言编写的开源Web框架。 Fiber 3.1.0及之前版本存在安全漏洞，该漏洞源于缓存中间件中的默认密钥生成器仅使用请求路径而不包含查询字符串，导致具有不同查询参数的相同路径请求可能共享缓存密钥并接收错误的缓存响应，可能导致查询相关端点的响应混淆并暴露其他请求的数据。

CVSS 6.5 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
gofiber fiber >= v3.0.0-beta.2, < 3.1.0 affected
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I. Basic Information for CVE-2026-30246

Vulnerability Information
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Vulnerability Title
github.com/gofiber/fiber/v3 cache middleware can mix responses across query parameters
Source: CVE Program / CVE List V5
Vulnerability Description
Fiber is a web framework for Go. In github.com/gofiber/fiber/v3 versions through 3.1.0, the default key generator in the cache middleware uses only the request path and does not include the query string. As a result, requests for the same path with different query parameters can share a cache key and receive the wrong cached response. This can cause response mix-up for query-dependent endpoints and may expose data intended for a different request. This issue is fixed after version 3.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5
Vulnerability Title
Fiber 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fiber是Fiber开源的一款使用Go语言编写的开源Web框架。 Fiber 3.1.0及之前版本存在安全漏洞，该漏洞源于缓存中间件中的默认密钥生成器仅使用请求路径而不包含查询字符串，导致具有不同查询参数的相同路径请求可能共享缓存密钥并接收错误的缓存响应，可能导致查询相关端点的响应混淆并暴露其他请求的数据。
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

Vendor Product Affected Versions CPE Subscribe
gofiber fiber >= v3.0.0-beta.2, < 3.1.0 -

II. Public POCs for CVE-2026-30246

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III. Intelligence Information for CVE-2026-30246

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Patches & Fixes for CVE-2026-30246 (1)

Vendor Advisories for CVE-2026-30246 (1)

IV. Related Vulnerabilities

Same product: fiber
Same vendor: gofiber
Same weakness: CWE-436

V. Comments for CVE-2026-30246

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