CVE-2026-27959

CVE-2026-27959 · Koa has Host Header Injection via `ctx.hostname`

Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.

Koa is middleware for Node.js using ES2017 async functions. Prior to versions 3.1.2 and 2.16.4, Koa's `ctx.hostname` API performs naive parsing of the HTTP Host header, extracting everything before the first colon without validating the input conforms to RFC 3986 hostname syntax. When a malformed Host header containing a `@` symbol is received, `ctx.hostname` returns `evil[.]com` - an attacker-controlled value. Applications using `ctx.hostname` for URL generation, password reset links, email verification URLs, or routing decisions are vulnerable to Host header injection attacks. Versions 3.1.2 and 2.16.4 fix the issue.

CVSS 7.5 · Alta · EPSS 0,4% · Corrección disponible

Publicación

2026-02-26T01:45:45.668Z

Actualización

2026-07-15T01:12:18.807Z

Pila tecnológica: node

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