CVE-2026-89066
Received Received - Intake

Command Injection in Projen

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: AMZN

Description
Improper neutralization of special elements used in an OS command in the task synthesis component in projen before 0.103.0 might allow context-dependent attackers to execute arbitrary commands on a developer workstation or continuous integration runner via shell metacharacters in project configuration values and repository file names that are interpolated into generated task definitions. To remediate this issue, users should upgrade to version 0.103.0 and then re-synthesize the project so that .projen/tasks.json is regenerated with the corrected task definitions. Upgrading alone is not sufficient because the generated task definition file is committed to the repository.

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Meta Information

Published
2026-09-11
Last Modified
2026-09-11
Generated
2026-09-11
AI Q&A
2026-09-11
EPSS Evaluated
N/A
NVD
CVE-2026-89066
EUVD
EUVD-2026-76151

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
projen projen 0.103.0
projen projen 0.101.37

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CWE-88 The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.

Attack-Flow Graph

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Executive Summary

This vulnerability involves improper neutralization of special elements used in an OS command within the task synthesis component of projen before version 0.103.0. Attackers could exploit shell metacharacters in project configuration values or repository file names to execute arbitrary commands on a developer workstation or CI runner.

Detection Guidance

This vulnerability involves improper neutralization of special elements in OS commands within projen's task synthesis component. To detect it, inspect project configuration files and generated task definitions for shell metacharacters or suspicious command interpolations. Check for recent task execution logs that may show unexpected command behavior.

Impact Analysis

The vulnerability allows attackers to run arbitrary commands on your system if they can inject shell metacharacters into project files or configurations. This could lead to data theft, system compromise, or unauthorized actions on your development or CI environment.

Mitigation Strategies

Upgrade projen to version 0.103.0 or later. After upgrading, re-synthesize the project to regenerate the .projen/tasks.json file with corrected task definitions. Do not rely solely on upgrading as the generated file may be committed to the repository.

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