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CVE-2026-25882— Fiber has a Denial of Service Vulnerability via Route Parameter Overflow

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 v2 2.52.12之前版本和v3 3.1.0之前版本存在安全漏洞，该漏洞源于路由注册期间缺少验证以及请求匹配期间存在无界数组写入，可能导致应用程序崩溃和拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.81% · P55

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-25882

Vulnerability Information
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Vulnerability Title
Fiber has a Denial of Service Vulnerability via Route Parameter Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
Fiber is an Express inspired web framework written in Go. A denial of service vulnerability exists in Fiber v2 and v3 that allows remote attackers to crash the application by sending requests to routes with more than 30 parameters. The vulnerability results from missing validation during route registration combined with an unbounded array write during request matching. Version 2.52.12 patches the issue in the v2 branch and 3.1.0 patches the issue in the v3 branch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
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 v2 2.52.12之前版本和v3 3.1.0之前版本存在安全漏洞，该漏洞源于路由注册期间缺少验证以及请求匹配期间存在无界数组写入，可能导致应用程序崩溃和拒绝服务。
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 >= 2.0.0, < 2.52.12 -

II. Public POCs for CVE-2026-25882

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III. Intelligence Information for CVE-2026-25882

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Patches & Fixes for CVE-2026-25882 (1)

Vendor Advisories for CVE-2026-25882 (1)

Same Patch Batch · gofiber · 2026-02-24 · 3 CVEs total

CVE-2026-25899 7.5 HIGH Fiber is Vulnerable to Denial of Service via Flash Cookie Unbounded Allocation
CVE-2026-25891 Fiber has an Arbitrary File Read in Static Middleware on Windows

IV. Related Vulnerabilities

Same product: fiber
Same vendor: gofiber
Same weakness: CWE-129

V. Comments for CVE-2026-25882

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