What is CVE-2026-89066?

CVE-2026-89066 is a high-severity vulnerability, classified under OS Command Injection. CVSS score: 7.8/10. Published 2026-09-11.

How severe is CVE-2026-89066?

High severity. CVSS v3 base score is 7.8 out of 10.

CVE-2026-89066

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. 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.

Vulnerability class: Command Injection (OS Command Injection)

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Weakness classification (CWE)

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory)

Frequently asked questions

What is CVE-2026-89066?: CVE-2026-89066 is a high-severity vulnerability, classified under OS Command Injection. CVSS score: 7.8/10. Published 2026-09-11.
How severe is CVE-2026-89066?: High severity. CVSS v3 base score is 7.8 out of 10.