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CVE-2026-42089 yeoman CVE debrief

CVE-2026-42089 is a high-severity vulnerability in Yeoman Environment, a tool for discovering, creating, and running generators. The vulnerability affects versions 2.9.0 through 6.0.0 and allows for arbitrary package installation and code execution during CLI bootstrap. This is possible because the `installLocalGenerators()` method installs missing local generator packages from caller-supplied package names without user confirmation. The vulnerability has been fixed in version 6.0.0.

Vendor
yeoman
Product
environment
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-06-16
Advisory published
2026-06-16
Advisory updated
2026-06-16

Who should care

Developers and users of Yeoman Environment, especially those who pass attacker-controlled project configuration into the `installLocalGenerators()` method, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The `installLocalGenerators()` method in Yeoman Environment installs missing local generator packages from caller-supplied package names without user confirmation. This allows for arbitrary package installation and code execution during CLI bootstrap. The vulnerability has a CVSS score of 8.6 and is considered high-severity.

Defensive priority

High

Recommended defensive actions

  • Upgrade to version 6.0.0 or later of Yeoman Environment.
  • Avoid passing attacker-controlled project configuration into the `installLocalGenerators()` method.

Evidence notes

The vulnerability was reported by an unknown vendor and has been confirmed by the Yeoman Environment team. The fix is available in version 6.0.0.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42089 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42089

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-42089 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42089

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.