HighFix available

launch-editor: `fs.existsSync()` existence check can be bypassed on Windows

Type: advisorySources: OSV

### Summary `launch-editor` checked `fs.existsSync(fileName)` before passing a supplied path to an editor command. On Windows, an attacker can bypass this check with a crafted path ending in `\\..:line:column`. This removes the requirement that the attacker be able to place a file with a malicious filename. Combined with the `%` escaping issue described in [GHSA-698v-4r3x-3vcv](https://github.com/vitejs/launch-editor/security/advisories/GHSA-698v-4r3x-3vcv), this bypass can lead to OS command injection when an attacker controls the file argument. ### Impact Only apps that runs on Windows is affected. ### Details The earlier advisory assumed that `fs.existsSync()` required an attacker-controlled filename to exist. This advisory covers a bypass of that requirement. A crafted value ending in `\\..:1:1` is interpreted differently by `launch-editor-middleware`, `launch-editor`, and Windows: 1. `launch-editor-middleware` calls `path.resolve()` while the final path component is `..:1:1`, so it is not treated as a parent-directory component. 2. `launch-editor` treats `:1:1` as a line-and-column suffix and removes it, leaving a path ending in `\\..`. 3. On Windows, `fs.existsSync()` accepts the resulting path as the existing parent directory even though the attacker-controlled preceding component does not exist. 4. Because the existence check passes, the crafted filename reaches the Windows shell command.

Products: launch-editor, vite, vite-plus
Affected versions: Not specified
Fixed versions: 1.1.0, 2.14.2, 6.4.4, 7.3.7, 8.1.6, 8.2.4, 8.3.3
CVEs: CVE-2026-112942
Confirmed fixed CVEs: Not specified
Updated in this feed: 31 Oct 2026, 13:20 UTC · Revision 1

Source evidence

launch-editor: `fs.existsSync()` existence check can be bypassed on Windows

core-osv · Original source

Published 20 Oct 2026, 19:48 UTC

osv:GHSA-587h-7wmj-h5pm

launch-editor

Fixed versions: 2.14.2

vite

Fixed versions: 8.3.3

vite

Fixed versions: 8.2.4

vite

Fixed versions: 8.1.6

vite

Fixed versions: 7.3.7

vite

Fixed versions: 6.4.4

vite-plus

Fixed versions: 1.1.0

Complete source record

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  "url": "https://osv.dev/vulnerability/GHSA-587h-7wmj-h5pm",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "launch-editor: `fs.existsSync()` existence check can be bypassed on Windows",
    "summary": "### Summary `launch-editor` checked `fs.existsSync(fileName)` before passing a supplied path to an editor command. On Windows, an attacker can bypass this check with a crafted path ending in `\\\\..:line:column`. This removes the requirement that the attacker be able to place a file with a malicious filename. Combined with the `%` escaping issue described in [GHSA-698v-4r3x-3vcv](https://github.com/vitejs/launch-editor/security/advisories/GHSA-698v-4r3x-3vcv), this bypass can lead to OS command injection when an attacker controls the file argument. ### Impact Only apps that runs on Windows is affected. ### Details The earlier advisory assumed that `fs.existsSync()` required an attacker-controlled filename to exist. This advisory covers a bypass of that requirement. A crafted value ending in `\\\\..:1:1` is interpreted differently by `launch-editor-middleware`, `launch-editor`, and Windows: 1. `launch-editor-middleware` calls `path.resolve()` while the final path component is `..:1:1`, so it is not treated as a parent-directory component. 2. `launch-editor` treats `:1:1` as a line-and-column suffix and removes it, leaving a path ending in `\\\\..`. 3. On Windows, `fs.existsSync()` accepts the resulting path as the existing parent directory even though the attacker-controlled preceding component does not exist. 4. Because the existence check passes, the crafted filename reaches the Windows shell command.",
    "evidence": "osv:GHSA-587h-7wmj-h5pm",
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      "aliases": [
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      ],
      "modified": "2026-10-20T20:00:04.608979840Z",
      "provider": "osv",
      "references": [
        "https://github.com/vitejs/launch-editor/security/advisories/GHSA-587h-7wmj-h5pm",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-112942",
        "https://github.com/vitejs/launch-editor/commit/f13cd835d4b8e860b1d4d080ad8a490cc2463679",
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  "source_id": "core-osv",
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  "published_at": "2026-10-20T19:48:25+00:00"
}