CVE-2026-89066 OS command injection in the task synthesis component in projen
Attackers can execute arbitrary commands on developer workstations or CI runners via shell metacharacters in projen project configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-89066?
CVE-2026-89066 is a high-severity command injection vulnerability in AWS projen, published on 11 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-89066?
How do I fix CVE-2026-89066?
No fix has been published for CVE-2026-89066 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-89066 being exploited?
There is no known exploitation of CVE-2026-89066 in the wild and no public exploit code.
Sources
Also known as GHSA-q6g4-h6vc-vqm8.