---
id: CVE-2026-89066
title: >-
  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 int…
summary: >-
  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 int…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-78
  - CWE-88
vendor: AWS
product: projen
affected:
  - projen < 0.103.0
published: '2026-09-11'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T18:24:59.400'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89066'
references:
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-108-aws/'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
  - url: 'https://github.com/projen/projen/releases/tag/v0.103.0'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
  - url: 'https://github.com/projen/projen/security/advisories/GHSA-q6g4-h6vc-vqm8'
    label: ff89ba41-3aa1-4d27-914a-91399e9639e5
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-11T16:20:54.930694Z'
ingestedAt: '2026-09-11T16:45:47.862Z'
epss: 0.00234
epssPercentile: 0.12743
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.