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Fencer Intel
low 3.3

CVE-2026-115569 json

Fallow: Jest and Vitest `projects` entries let an analyzed repository make Fallow read files outside the project root

published 17d ago modified 10d ago also GHSA-jfwm-3p3c-6hx5 , EUVD-2026-109119

cvss
3.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm fallow 3.34.0
  • npm @fallow-cli/fallow-node 3.34.0
  • crates.io fallow-cli 3.34.0
  • crates.io fallow-core 3.34.0

Is CVE-2026-115569 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
10d ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
GitHub 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
npm fallow
>=2.68.0, <3.34.0
3.34.0
npm @fallow-cli/fallow-node
>=2.68.0, <3.34.0
3.34.0
crates.io fallow-cli
>=2.68.0, <3.34.0
3.34.0
crates.io fallow-core
>=2.68.0, <3.34.0
3.34.0

Affected products

  • fallow-rs fallow
  • @fallow-cli fallow-node
  • fallow-rs fallow-cli
  • fallow-rs fallow-core

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.