# CVE-2026-122193: OS command injection in the example SSM documents in Trusted Remote Execution (REX)

> CVE-2026-122193: OS command injection in the example SSM documents in Trusted Remote Execution (REX). CVSS 9.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-122193
Last updated: 2026-11-06T21:17:07Z

- Published: 2026-11-06 17:09 UTC · Updated: 2026-11-06 21:17 UTC · Assigner: AMZN
- CVSS: 9.9 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS: 1.6%, 76th percentile (scored 2026-11-10)
- CISA KEV: no
- CWE: CWE-78

## Description

OS command injection in the example SSM document provisioning script in Trusted Remote Execution (REX) before 2026-07-28 might allow an authenticated remote user who is permitted to invoke the Rex-RO or Rex-RW SSM document to execute arbitrary commands as root on the managed instance, bypassing Cedar policy enforcement. To remediate this issue, users should delete any Rex-RO and Rex-RW SSM documents created from the example script, in each account and Region where it was run.

## Affected vendors and products

- AWS: trusted-remote-execution

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-122193)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-122193)
- [https://aws.amazon.com/security/security-bulletins/2026-173-aws/](https://aws.amazon.com/security/security-bulletins/2026-173-aws/)
- [https://github.com/trusted-remote-execution/trusted-remote-execution/security/advisories/GHSA-95g5-m242-wvhr](https://github.com/trusted-remote-execution/trusted-remote-execution/security/advisories/GHSA-95g5-m242-wvhr)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-122193 · Markdown: https://rewindex.com/cve/CVE-2026-122193.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-122193 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-11T04:21:53.521Z