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CVE-2026-42089

yeoman-environment Vulnerable to Arbitrary Package Installation without User Confirmation

8.6 HighPublic exploitFix available

Yeoman Environment provides an API to discover, create, and run generators, and to configure where and how a generator is resolved. Versions 2.9.0 through 6.0.0 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. This issue has been fixed in version 6.0.0.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.17%Up 0.2 points since Jun 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.6

yeoman-environment Vulnerable to Arbitrary Package Installation without User Confirmation

Yeoman Environment provides an API to discover, create, and run generators, and to configure where and how a generator is resolved. Versions 2.9.0 through 6.0.0 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. This issue has been fixed in version 6.0.0.

Record
CVE-2026-42089
CVSS 3.1
8.6 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness
CWE-829
Updated
2026-11-02
EUVDEUVD-2026-37131 8.6

Yeoman Environment provides an API to discover, create, and run generators, and to configure where and how a generator is resolved. Versions 2.9.0 through 6.0.0 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. This issue has been fixed in version 6.0.0.

Record
EUVD-2026-37131
CVSS 3.1
8.6 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-vv9j-gjw2-j8wp 8.6

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

Record
GHSA-vv9j-gjw2-j8wp
CVSS 3.1
8.6 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness
CWE-829
Updated
2026-11-02
NVD 8.6

Yeoman Environment provides an API to discover, create, and run generators, and to configure where and how a generator is resolved. Versions 2.9.0 through 6.0.0 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. This issue has been fixed in version 6.0.0.

Record
CVE-2026-42089
CVSS 3.1
8.6 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness
CWE-829
Updated
2026-11-02
OSV 8.6

yeoman-environment Vulnerable to Arbitrary Package Installation without User Confirmation

Yeoman Environment provides an API to discover, create, and run generators, and to configure where and how a generator is resolved. Versions 2.9.0 through 6.0.0 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. This issue has been fixed in version 6.0.0.

Record
CVE-2026-42089
CVSS 3.1
8.6 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness
CWE-829
Updated
2026-11-02
OSVGHSA-vv9j-gjw2-j8wp 8.6

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

Record
GHSA-vv9j-gjw2-j8wp
CVSS 3.1
8.6 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness
CWE-829
Updated
2026-11-02
OSVCLSA-2026-1789069708 No score

TuxCare security update for yeoman-environment (1 CVE)

TuxCare rebuilt yeoman-environment to address 1 CVE. Fixed in 3.19.3-tuxcare.1.

Record
CLSA-2026-1789069708
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
yeoman-environment
npm
 2.9.0 up to 6.0.1
6.0.1
yeoman-environment
TuxCare:npm
 3.19.3-tuxcare.0 up to 3.19.3-tuxcare.1, plus listed versions
3.19.3
3.19.3-tuxcare.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHub0xmrma/CVE-2026-420892026-06-26

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-42089 is a high vulnerability (CVSS 8.6) in Yeoman Environment, published May 26, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. Fixed in yeoman-environment 6.0.1.

References

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