Command Injection Vulnerability in Projen by GitHub
CVE-2026-89066

8.4HIGH

Key Information:

Vendor

Aws

Status
Projen
Vendor
CVE Published:
11 September 2026

What is CVE-2026-89066?

The projen task synthesis component is susceptible to a command injection vulnerability due to improper handling of special elements in OS commands. Attackers can exploit this flaw on developer workstations or continuous integration runners by injecting malicious shell metacharacters into project configuration values or repository file names. This results in the unintended execution of arbitrary commands when task definitions are generated. To resolve this issue, upgrading to version 0.103.0 is necessary, followed by re-synthesizing the project to regenerate the .projen/tasks.json file with the correct definitions.

Affected Version(s)

projen 0 < 0.103.0

References

https://github.com/projen/projen/releases/tag/v0.103.0
patch
https://aws.amazon.com/security/security-bulletins/2026-1...
vendor-advisory

CVSS V4

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.