by Kastro
Paper/Archive/CVE-2026-122193

CVE-2026-122193

AWS trusted-remote-execution — OS command injection in the example SSM documents in Trusted Remote Execution (REX)

CVSS 9.9
critical.is priorityof 100
30
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
trusted-remote-executionN/A–CNA

Scores by source

AMZN (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AMZN (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:L/SA:N

References

advisoryaws.amazon.com/security/security-bulletins/2026-173-awswriteupgithub.com/trusted-remote-execution/trusted-remote-execution/security/advisories/GHSA-95g5-m242-wvhr