{"id":"CVE-2026-54286","sourceIdentifier":"security-advisories@github.com","published":"2026-06-22T18:16:47.213","lastModified":"2026-10-25T23:10:00.167","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on Windows hosts, an encoded backslash (%5C) in the request path decodes to \\, which the Windows path resolver treats as a separator. serve-static then resolves a single URL segment such as admin\\secret.txt into a nested file under the root and serves it, letting an attacker read static files meant to be protected behind prefix-mounted middleware. This vulnerability is fixed in 4.12.25."},{"lang":"es","value":"Hono es un framework de aplicación web que proporciona soporte para cualquier entorno de ejecución de JavaScript. Antes de la versión 4.12.25, en hosts de Windows, una barra invertida codificada (%5C) en la ruta de la solicitud se decodifica a \\, que el resolvedor de rutas de Windows trata como un separador. serve-static entonces resuelve un único segmento de URL como admin\\secret.txt en un archivo anidado bajo la raíz y lo sirve, permitiendo a un atacante leer archivos estáticos destinados a ser protegidos detrás de un middleware montado con prefijo. Esta vulnerabilidad está corregida en la versión 4.12.25."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"honojs","product":"hono","versions":[{"version":"< 4.12.25","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":2.2,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-23T14:07:25.570505Z","id":"CVE-2026-54286","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-22"}]}],"references":[{"url":"https://github.com/honojs/hono/security/advisories/GHSA-wwfh-h76j-fc44","source":"security-advisories@github.com"}]}