CVE-2026-122193

OS command injection in the example SSM documents in Trusted Remote Execution (REX)

Published Nov 6, 2026 CVSS 4.0 · 9.3 Critical EPSS 1.6% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title OS command injection in the example SSM documents in Trusted Remote Execution (REX)
First Time appeared Aws
Aws trusted-remote-execution
Weaknesses CWE-78
CPEs cpe:2.3:a:aws:trusted-remote-execution:n_a:*:*:*:*:*:*:*
Vendors & Products Aws
Aws trusted-remote-execution
References
Metrics cvssV3_1

{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:L/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Nov 6, 2026, 8:35 PM
Reserved
Nov 4, 2026, 7:50 PM
Status
Awaiting Analysis
Published
Nov 6, 2026, 5:17 PM
Modified
Nov 12, 2026, 7:24 PM