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CVE-2026-54286

Hono: Path traversal in `serve-static` on Windows via encoded backslash (`%5C`) PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
honojs / honoaffected < 4.12.25

CWE

CWE-22

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.