CVE-2026-54286
CVE-2026-54286 · Hono: Path traversal in `serve-static` on Windows via encoded backslash (`%5C`)
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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.
CVSS 5.9 · Medium · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node