CVE-2026-122193

critical

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.

References

https://github.com/trusted-remote-execution/trusted-remote-execution/security/advisories/GHSA-95g5-m242-wvhr

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-118379

https://aws.amazon.com/security/security-bulletins/2026-173-aws/

Details

Source: Mitre, NVD

Published: 2026-11-06

Updated: 2026-11-06

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 9.9

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base 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

Severity: Critical

EPSS

EPSS: 0.01626