Fallow is a codebase intelligence tool for TypeScript and JavaScript. From 2.68.0 until 3.34.0, Fallow follows attacker-controlled Jest projects paths outside the project root through absolute paths, parent segments, dot-prefixed wildcard globs, or symlinks. In version 3.33.1, the same behavior also affects Vitest test.projects paths, Vitest inline-project extends paths, and symlinked script --config paths.
Fallow parses the outside files as test-runner configuration and uses them to credit dependencies, setup files, and JSX import sources, which can change unused dependency and unused file findings in CI or agent analysis. The outside file contents are not printed or sent over the network. This issue is fixed in version 3.34.0.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/fallow-rs/fallow/commit/75c0c60948a53ddfe042e65b446343989f4c…
security-advisories@github.com
https://github.com/fallow-rs/fallow/pull/3556
security-advisories@github.com
https://github.com/fallow-rs/fallow/releases/tag/v3.34.0
security-advisories@github.com
https://github.com/fallow-rs/fallow/security/advisories/GHSA-jfwm-3p3c-6hx5
security-advisories@github.com