CVE-2026-9495
HighCVSS 7.3Exploitation Probability (EPSS)
Low risk28th percentile - higher than 28% of all known CVEs
Summary
Access control bypass vulnerability in the @koa/router package from version 14.0.0 before 15.0.0. When the router prefix contains path parameters, middleware is silently dropped from the execution chain, potentially allowing an attacker to bypass authentication, authorization, rate limiting, or input sanitization.
Risk Assessment
An attacker can gain unauthorized access to protected resources or functions, potentially leading to data security breaches.
Recommendation
Update the @koa/router package to version 15.0.0 or later.
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Original NVD description (English source)
Versions of the package @koa/router from 14.0.0 and before 15.0.0 are vulnerable to Access Control Bypass due to the middleware being silently dropped from the execution chain when the router prefix contains path parameters. Depending on what the skipped middleware was supposed to protect, an attacker could bypass authentication and authorization, evade rate limiting or bypass input sanitization.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS