coursevault-preview has a path traversal due to improper base-directory boundary validation

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.1 · CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

• CVE-2026-35613: 0.14% estimated exploitation activity in the next 30 days; percentile 3.44 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary 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. Details The vulnerable code in src/utils/errors.ts: Because the check is a raw string prefix test rather than a path-boundary test, the following bypass is possible: Any 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. The fix replaces the check with a separator-aware comparison: Impact An application that passes untrusted input as the relativePath argument to…

Published by the source

8 Apr 2026, 00:06 UTC

Last modified by the source

8 Apr 2026, 00:27 UTC

Source last checked

26 Oct 2026, 12:47 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-9h9m-rr67-9jpg

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-9h9m-rr67-9jpg

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# Patch Next advisory brief: CVE-2026-35613

Advisory: coursevault-preview has a path traversal due to improper base-directory boundary validation
IDs: CVE-2026-35613, GHSA-9h9m-rr67-9jpg
Record: https://patchnext.com/advisories/cve-2026-35613 (revision 2, source checked 26 Oct 2026, 12:47 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: coursevault-preview 0.1.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm coursevault-preview: affected < 0.1.1; fixed in 0.1.1

## Suggested inspection (read-only)
- `npm ls coursevault-preview --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on coursevault-preview.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-9h9m-rr67-9jpg (OSV record GHSA-9h9m-rr67-9jpg lists affected ranges: npm coursevault-preview >=0 <0.1.1 (fixed))
- Verified: https://github.com/advisories/GHSA-9h9m-rr67-9jpg (GitHub-reviewed advisory GHSA-9h9m-rr67-9jpg lists affected ranges: npm coursevault-preview >=0 <0.1.1)

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