Affected versions of bitty are vulnerable to directory traversal via the URL path in GET requests.

Recommendation

The bitty package is not currently maintained, and has not seen an update since 2015.

At this time, the best available mitigation is to use an alternative module that is actively maintained and provides similar functionality, such as serve.

References

• https://nvd.nist.gov/vuln/detail/CVE-2016-10561
• GHSA-f5mh-hq6h-whxv
• https://www.npmjs.com/advisories/150