CVE-2026-54286

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.

Score
CVSS 3.1 5.9 Medium
Status
Deferred - security-advisories@github.com
Published
2026-06-22
Last modified
2026-10-25
Weaknesses
CWE-22

Affected products

References

 
 
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