GHSA-frvp-7c67-39w9: @hono/node server Path Traversal Vulnerability
MODERATEGHSA-frvp-7c67-39w9 is a MODERATE (CVSS 5.9) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting @hono/node server libraries in the npm ecosystem. The issue involves path traversal in `serve-static` on windows via encoded backslash (`%5c`). Remediation is available by upgrading affected packages to version 2.0.5, 1.19.15.
GHSA-frvp-7c67-39w9 at a Glance
Security Impact
CVSS: 5.9
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
How to Fix GHSA-frvp-7c67-39w9
To remediate this vulnerability, upgrade all affected @hono/node server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
npm install @hono/node-server@2.0.5npm install @hono/node-server@1.19.15Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls @hono/node-serverHow to Check if You Are Affected
To determine whether your Node.js application is affected by GHSA-frvp-7c67-39w9, inspect your project dependencies using npm:
npm ls @hono/node-serverAnalyze the terminal output to locate any version of @hono/node server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.5), your application is affected.
Note: The npm ls @hono/node-server command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In @hono/node server, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
GHSA-frvp-7c67-39w9 Affected @hono/node server Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
@hono/node-server
|
npm |
≥ 2.0.0
< 2.0.5
|
2.0.5
|
|
@hono/node-server
|
npm |
< 1.19.15
|
1.19.15
|
References
Frequently Asked Questions
What is GHSA-frvp-7c67-39w9?
Which @hono/node server versions are affected?
What version fixes GHSA-frvp-7c67-39w9?
Is @hono/node-server affected?
What is the CVSS score of GHSA-frvp-7c67-39w9?
What CWE is associated with GHSA-frvp-7c67-39w9?
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Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-frvp-7c67-39w9",
"modified" : "2026-08-12T18:26:49Z",
"published" : "2026-07-21T18:17:25Z",
"aliases" : [ ],
"summary" : "Node.js Adapter for Hono: Path traversal in `serve-static` on Windows via encoded backslash (`%5C`)",
"details" : "The same as the `hono` core [Path traversal in `serve-static` on Windows via encoded backslash (`%5C`)](https://github.com/honojs/hono/security/advisories/GHSA-wwfh-h76j-fc44).\n\n### Summary\n\nOn 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. Directory escape (`..`) remains blocked.\n\n### Details\n\nThe router splits paths only on `/`, so `/admin%5Csecret.txt` is one segment and middleware on `/admin/*` does not run. The `serve-static` guard rejects `.`/`..` and consecutive separators but lets a lone `\\` through; on Windows the file resolver re-splits it into the protected subtree.\n\nThis affects Windows hosts serving static files via the Node, Bun, or Deno adapters that guard a static subtree with prefix-mounted middleware.\n\n### Impact\n\nAn unauthenticated attacker can read static files under a middleware-guarded prefix on Windows hosts. The read stays within the configured root; escape outside the root is not possible.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "@hono/node-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.0.0"
}, {
"fixed" : "2.0.5"
} ]
} ]
}, {
"package" : {
"ecosystem" : "npm",
"name" : "@hono/node-server"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.19.15"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/honojs/node-server/security/advisories/GHSA-frvp-7c67-39w9"
}, {
"type" : "WEB",
"url" : "https://github.com/honojs/node-server/commit/cd076e117cfe4cb8d31f9eb11d2e8f38a6cb8faf"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/honojs/node-server"
}, {
"type" : "WEB",
"url" : "https://github.com/honojs/node-server/releases/tag/v2.0.5"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-07-21T18:17:25Z",
"nvd_published_at" : null
}
}