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CVE-2026-89065 and CVE-2026-89066: Issue with projen - Path traversal and OS command injection

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CVE-2026-89065 and CVE-2026-89066: Issue with projen - Path traversal and OS command injection

Bulletin ID: 2026-108-AWS
Scope: AWS
Content Type: Important (requires attention)
Publication Date: 09/11/2026 09:00 AM PDT

projen is an open-source tool for defining and synthesizing software project configurations as code. AWS identified two issues in projen affecting the generated file manifest cleanup component and the task synthesis component.

  • CVE-2026-89065 — Relative path traversal in the generated file manifest cleanup component in projen before 0.101.37 might allow context-dependent attackers to recursively delete files and directories outside the project directory, via crafted entries in the version-controlled generated file manifest (.projen/files.json) that is consumed during project synthesis. The corrected containment check is automatically applied by the projen runtime the next time it is run.
  • CVE-2026-89066 — 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 in .projen/tasks.json.
  • All projen versions before 0.101.37 (CVE-2026-89065)
  • All projen versions before 0.103.0 (CVE-2026-89066)
  • CVE-2026-89065 has been addressed in projen version 0.101.37. Upgrading to 0.101.37 or later is sufficient; re-synthesis is not required.
  • CVE-2026-89066 has been addressed in projen version 0.103.0. After upgrading, you must re-synthesize your project to regenerate .projen/tasks.json with the corrected task definitions. Upgrading alone is not sufficient because the generated task definition file is committed to the repository.

    • We recommend upgrading to the latest version and ensuring any derivative code is patched to incorporate the new fixes.

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    Read the original at the source: https://aws.amazon.com/security/security-bulletins/rss/2026-108-aws/

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    Provenance

    Organization
    Amazon Web Services — imported from official source
    Official source
    https://aws.amazon.com/security/security-bulletins/feed/ RSS
    Imported
    September 18, 2026 09:42
    Versions
    1 recorded
    Identity
    ef4cd83570acec55c1248107099ca3e5cc8be6bf

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