{"id":"GHSA-587h-7wmj-h5pm","summary":"launch-editor: `fs.existsSync()` existence check can be bypassed on Windows","details":"### Summary\n\n`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.\n\nCombined 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.\n\n### Impact\n\nOnly apps that runs on Windows is affected.\n\n### Details\n\nThe earlier advisory assumed that `fs.existsSync()` required an attacker-controlled filename to exist. This advisory covers a bypass of that requirement.\n\nA crafted value ending in `\\\\..:1:1` is interpreted differently by `launch-editor-middleware`, `launch-editor`, and Windows:\n\n1. `launch-editor-middleware` calls `path.resolve()` while the final path component is `..:1:1`, so it is not treated as a parent-directory component.\n2. `launch-editor` treats `:1:1` as a line-and-column suffix and removes it, leaving a path ending in `\\\\..`.\n3. On Windows, `fs.existsSync()` accepts the resulting path as the existing parent directory even though the attacker-controlled preceding component does not exist.\n4. Because the existence check passes, the crafted filename reaches the Windows shell command.","aliases":["CVE-2026-112942"],"modified":"2026-10-20T20:00:04.608979840Z","published":"2026-10-20T19:48:25Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-10-20T19:48:25Z","nvd_published_at":"2026-10-20T15:17:17Z","cwe_ids":["CWE-77"]},"references":[{"type":"WEB","url":"https://github.com/vitejs/launch-editor/security/advisories/GHSA-587h-7wmj-h5pm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112942"},{"type":"WEB","url":"https://github.com/vitejs/launch-editor/commit/f13cd835d4b8e860b1d4d080ad8a490cc2463679"},{"type":"PACKAGE","url":"https://github.com/vitejs/launch-editor"},{"type":"WEB","url":"https://github.com/vitejs/launch-editor/releases/tag/v2.14.2"}],"affected":[{"package":{"name":"launch-editor","ecosystem":"npm","purl":"pkg:npm/launch-editor"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.14.2"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 2.14.1","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-587h-7wmj-h5pm/GHSA-587h-7wmj-h5pm.json"}},{"package":{"name":"vite","ecosystem":"npm","purl":"pkg:npm/vite"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.3.0"},{"fixed":"8.3.3"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 8.3.2","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-587h-7wmj-h5pm/GHSA-587h-7wmj-h5pm.json"}},{"package":{"name":"vite","ecosystem":"npm","purl":"pkg:npm/vite"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.2.0"},{"fixed":"8.2.4"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 8.2.3","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-587h-7wmj-h5pm/GHSA-587h-7wmj-h5pm.json"}},{"package":{"name":"vite","ecosystem":"npm","purl":"pkg:npm/vite"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.1.6"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 8.1.5","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-587h-7wmj-h5pm/GHSA-587h-7wmj-h5pm.json"}},{"package":{"name":"vite","ecosystem":"npm","purl":"pkg:npm/vite"},"ranges":[{"type":"SEMVER","events":[{"introduced":"7.0.0"},{"fixed":"7.3.7"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 7.3.6","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-587h-7wmj-h5pm/GHSA-587h-7wmj-h5pm.json"}},{"package":{"name":"vite","ecosystem":"npm","purl":"pkg:npm/vite"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"6.4.4"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 6.4.3","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-587h-7wmj-h5pm/GHSA-587h-7wmj-h5pm.json"}},{"package":{"name":"vite-plus","ecosystem":"npm","purl":"pkg:npm/vite-plus"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.1.0"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 1.0.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-587h-7wmj-h5pm/GHSA-587h-7wmj-h5pm.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}