CVE Watch15 jul 2026

CVE-2026-27959

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 pars

CVSS

7.5

Alto

EPSS

0.3%

p26

KEV

—

Exploit Today

0-100

Publicado: 26 feb 2026 · Última mod.: 15 jul 2026 · CWE-20

EPSS · 30d

0.3%EPSS · 30 días0.3%

2026-08-182026-09-14

Descripción técnica

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.

Referencias oficiales

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