CVE-2026-122193
OS command injection in the example SSM documents in Trusted Remote Execution (REX)
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| trusted-remote-execution AWS |
Version not specified (affected, custom)
Other versions: unaffected |
CNA: AMZN |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 9.9 critical |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | CNA: AMZN |
| 4.0 / 9.3 critical |
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 | CNA: AMZN |
| 4.0 / 9.3 critical |
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: ff89ba41-3aa1-4d27-914a-91399e9639e5 |
| 3.1 / 9.9 critical |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | NVD: ff89ba41-3aa1-4d27-914a-91399e9639e5 |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://aws.amazon.com/security/security-bulletins/2026-173-aws/CNA: AMZN · vendor-advisory
- https://github.com/trusted-remote-execution/trusted-remote-execution/security/advisories/GHSA-95g5-m242-wvhrCNA: AMZN · third-party-advisory
- https://aws.amazon.com/security/security-bulletins/2026-173-aws/ff89ba41-3aa1-4d27-914a-91399e9639e5
- https://github.com/trusted-remote-execution/trusted-remote-execution/security/advisories/GHSA-95g5-m242-wvhrff89ba41-3aa1-4d27-914a-91399e9639e5
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