Node.js CVE-2026-29087
HIGH
GHSA-wc8c-qw6v-h7f6
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
3Blast Radius
ecosystem impact- 5 npm packages depend on @hono/node-server (4 direct, 1 indirect)
Ecosystem-wide dependent count for version 1.19.10.
DescriptionGitHub Advisory
@hono/node-server allows running the Hono application on Node.js. Prior to version 1.19.10, when using @hono/node-server's static file serving together with route-based middleware protections (e.g. protecting /admin/*), inconsistent URL decoding can allow protected static resources to be accessed without authorization. In particular, paths containing encoded slashes (%2F) may be evaluated differently by routing/middleware matching versus static file path resolution, enabling a bypass where middleware does not run but the static file is still served. This issue has been patched in version 1.19.10.
AnalysisAI
@hono/node-server versions prior to 1.19.10 contain an authorization bypass in static file serving due to inconsistent URL decoding between routing middleware and file resolution logic. An unauthenticated remote attacker can bypass route-based access controls by crafting requests with encoded slashes (%2F) to access protected static resources that should be restricted by middleware. Organizations running affected versions should upgrade immediately as no workaround is available.
Technical ContextAI
This vulnerability (CWE-863: Incorrect Authorization) affects hono/node-server allows running the Hono application on Node.js.. @hono/node-server allows running the Hono application on Node.js. Prior to version 1.19.10, when using @hono/node-server's static file serving together with route-based middleware protections (e.g. protecting /admin/*), inconsistent URL decoding can allow protected static resources to be accessed without authorization. In particular, paths containing encoded slashes (%2F) may be evaluated differently by routing/middleware matching versus static file path resolution, enabling a bypass where middl
RemediationAI
Fixed in version 1.19.10.. Restrict network access to the affected service where possible.
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today