{"id":"CVE-2026-35613","aliases":["EUVD-2026-19790","GHSA-9h9m-rr67-9jpg"],"status":"published","title":"Path traversal in coursevault-preview due to improper base-directory boundary validation","description":"coursevault-preview is a utility for previewing course material files from a configured directory. coursevault-preview versions prior to 0.1.1 contain a path traversal vulnerability in the resolveSafe utility. The boundary check used String.prototype.startsWith(baseDir) on a normalized path, which does not enforce a directory boundary. An attacker who controls the relativePath argument to affected CoursevaultPreview methods may be able to read files outside the configured baseDir when a sibling directory exists whose name shares the same string prefix. This vulnerability is fixed in 0.1.1.","severity":{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00146,"percentile":0.03898,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22"],"published":"2026-04-07T16:39:44Z","modified":"2026-10-28T02:30:32Z","fixes":[{"ecosystem":"npm","package":"coursevault-preview","fixed_in":["0.1.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"coursevault-preview","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.1.1"}]}]},{"source":"osv","ecosystem":"npm","package":"coursevault-preview","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.1.1"}]}]}],"products":[{"vendor":"moritzmyrz","product":"coursevault-preview"}],"references":[{"url":"https://github.com/moritzmyrz/coursevault-preview/security/advisories/GHSA-9h9m-rr67-9jpg","tags":["x_refsource_CONFIRM","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35613","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9h9m-rr67-9jpg"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35613.json","tags":["advisory"]},{"url":"https://github.com/moritzmyrz/coursevault-preview","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-35613","title":"Path traversal in coursevault-preview due to improper base-directory boundary validation","description":"coursevault-preview is a utility for previewing course material files from a configured directory. coursevault-preview versions prior to 0.1.1 contain a path traversal vulnerability in the resolveSafe utility. The boundary check used String.prototype.startsWith(baseDir) on a normalized path, which does not enforce a directory boundary. An attacker who controls the relativePath argument to affected CoursevaultPreview methods may be able to read files outside the configured baseDir when a sibling directory exists whose name shares the same string prefix. This vulnerability is fixed in 0.1.1.","status":"published","published":"2026-04-07T16:39:44.237Z","modified":"2026-04-09T16:18:16.501Z","cvss":[{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:20:05.15083Z"}],"euvd":[{"id":"EUVD-2026-19790","description":"coursevault-preview is a utility for previewing course material files from a configured directory. coursevault-preview versions prior to 0.1.1 contain a path traversal vulnerability in the resolveSafe utility. The boundary check used String.prototype.startsWith(baseDir) on a normalized path, which does not enforce a directory boundary. An attacker who controls the relativePath argument to affected CoursevaultPreview methods may be able to read files outside the configured baseDir when a sibling directory exists whose name shares the same string prefix. This vulnerability is fixed in 0.1.1.","status":"published","published":"2026-04-07T16:39:44Z","modified":"2026-04-09T16:18:16Z","cvss":[{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T19:24:30.741683Z"}],"ghsa":[{"id":"GHSA-9h9m-rr67-9jpg","title":"coursevault-preview has a path traversal due to improper base-directory boundary validation","description":"## Summary\n\n`coursevault-preview` versions prior to `0.1.1` contain a path traversal vulnerability in the `resolveSafe` utility. The boundary check used `String.prototype.startsWith(baseDir)` on a normalized path, which does not enforce a directory boundary. An attacker who controls the `relativePath` argument to affected `CoursevaultPreview` methods may be able to read files outside the configured `baseDir` when a sibling directory exists whose name shares the same string prefix.\n\n## Details\n\nThe vulnerable code in `src/utils/errors.ts`:\n\n```ts\nif (!full.startsWith(base)) {   // ← insufficient\n  throw new Error(\"Path escapes the base directory\");\n}\n```\n\nBecause the check is a raw string prefix test rather than a path-boundary test, the following bypass is possible:\n\n```\nbaseDir  = \"/srv/courses\"\npayload  = \"../courses-admin/config.json\"\nresolved = \"/srv/courses-admin/config.json\"\n\n\"/srv/courses-admin/config.json\".startsWith(\"/srv/courses\") // → true ✗\n```\n\nAny file whose absolute path begins with the `baseDir` string — including files in sibling directories that share a name prefix — passes the guard and can be accessed by the caller through affected file-access methods.\n\nThe fix replaces the check with a separator-aware comparison:\n\n```ts\nif (full !== base \u0026\u0026 !full.startsWith(base + sep)) {\n  throw new Error(\"Path escapes the base directory\");\n}\n```\n\n## Impact\n\nAn application that passes untrusted input as the `relativePath` argument to affected file-access methods may expose file contents outside the intended directory.\n\n1. Attacker control over the `relativePath` parameter.\n2. A sibling directory on the filesystem whose name shares a string prefix with `baseDir`.\n\nThere is no network exposure in the package itself; impact is limited to local file disclosure within the host process's file system permissions.","status":"published","published":"2026-04-08T00:06:03Z","modified":"2026-04-08T00:06:05Z","cvss":[{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:39:51.193071Z"}],"nvd":[{"id":"CVE-2026-35613","description":"coursevault-preview is a utility for previewing course material files from a configured directory. coursevault-preview versions prior to 0.1.1 contain a path traversal vulnerability in the resolveSafe utility. The boundary check used String.prototype.startsWith(baseDir) on a normalized path, which does not enforce a directory boundary. An attacker who controls the relativePath argument to affected CoursevaultPreview methods may be able to read files outside the configured baseDir when a sibling directory exists whose name shares the same string prefix. This vulnerability is fixed in 0.1.1.","status":"published","published":"2026-04-07T17:16:35.583Z","modified":"2026-10-26T21:10:00.17Z","cvss":[{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:13.535987Z"}],"osv":[{"id":"CVE-2026-35613","title":"Path traversal in coursevault-preview due to improper base-directory boundary validation","description":"coursevault-preview is a utility for previewing course material files from a configured directory. coursevault-preview versions prior to 0.1.1 contain a path traversal vulnerability in the resolveSafe utility. The boundary check used String.prototype.startsWith(baseDir) on a normalized path, which does not enforce a directory boundary. An attacker who controls the relativePath argument to affected CoursevaultPreview methods may be able to read files outside the configured baseDir when a sibling directory exists whose name shares the same string prefix. This vulnerability is fixed in 0.1.1.","status":"published","published":"2026-04-07T16:39:44.237Z","modified":"2026-10-28T02:30:32.987233231Z","cvss":[{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:45:02.673625Z"},{"id":"GHSA-9h9m-rr67-9jpg","title":"coursevault-preview has a path traversal due to improper base-directory boundary validation","description":"## Summary\n\n`coursevault-preview` versions prior to `0.1.1` contain a path traversal vulnerability in the `resolveSafe` utility. The boundary check used `String.prototype.startsWith(baseDir)` on a normalized path, which does not enforce a directory boundary. An attacker who controls the `relativePath` argument to affected `CoursevaultPreview` methods may be able to read files outside the configured `baseDir` when a sibling directory exists whose name shares the same string prefix.\n\n## Details\n\nThe vulnerable code in `src/utils/errors.ts`:\n\n```ts\nif (!full.startsWith(base)) {   // ← insufficient\n  throw new Error(\"Path escapes the base directory\");\n}\n```\n\nBecause the check is a raw string prefix test rather than a path-boundary test, the following bypass is possible:\n\n```\nbaseDir  = \"/srv/courses\"\npayload  = \"../courses-admin/config.json\"\nresolved = \"/srv/courses-admin/config.json\"\n\n\"/srv/courses-admin/config.json\".startsWith(\"/srv/courses\") // → true ✗\n```\n\nAny file whose absolute path begins with the `baseDir` string — including files in sibling directories that share a name prefix — passes the guard and can be accessed by the caller through affected file-access methods.\n\nThe fix replaces the check with a separator-aware comparison:\n\n```ts\nif (full !== base \u0026\u0026 !full.startsWith(base + sep)) {\n  throw new Error(\"Path escapes the base directory\");\n}\n```\n\n## Impact\n\nAn application that passes untrusted input as the `relativePath` argument to affected file-access methods may expose file contents outside the intended directory.\n\n1. Attacker control over the `relativePath` parameter.\n2. A sibling directory on the filesystem whose name shares a string prefix with `baseDir`.\n\nThere is no network exposure in the package itself; impact is limited to local file disclosure within the host process's file system permissions.","status":"published","published":"2026-04-08T00:06:03Z","modified":"2026-04-08T00:27:17.222764Z","cvss":[{"version":"3.1","score":5.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:43.875515Z"}]}}