VYPR
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Medium severity5.9GHSA Advisory· Published Jun 22, 2026· Updated Jun 23, 2026

CVE-2026-54286

CVE-2026-54286

Description

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.

AI Insight

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
hononpm
< 4.12.254.12.25

Affected products

19

Patches

Vulnerability mechanics

References

3

News mentions

1