GHSA-vv9j-gjw2-j8wp: yeoman-environment Vulnerable to Arbitrary Package Installation without User Confirmation
Impact
yeoman-environment versions >= 2.9.0 and < 6.0.1 install missing local generator packages from caller-supplied package names without user confirmation. In downstream consumers that pass attacker-controlled project configuration into this path, this can result in arbitrary package installation and code execution during CLI bootstrap.
The vulnerable method is installLocalGenerators(), which calls repository.install() directly without prompting the user.
Patches
Upgrade to yeoman-environment 6.0.1, which adds an interactive confirmation prompt before installation (PR #753).
Workarounds
None.
Resources
- Fix commit 78d2af7
Details
Original advisory: https://github.com/advisories/GHSA-vv9j-gjw2-j8wp
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-420890.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-42089 | coverage & exploitation status | NVD · CVE.org |
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