Vulnerability details

CVE-2026-122193

AWS trusted-remote-execution

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

CVSS 4.0

9.3Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.3Critical	4.0	CVEProject cvelistV5 (CNA) (AMZN)	`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`
9.9Critical	3.1	CVEProject cvelistV5 (CNA) (AMZN)	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
AWS	trusted-remote-execution	All	CVEProject cvelistV5 (CNA)

References and advisories

https://aws.amazon.com/security/security-bulletins/2026-173-aws/ vendor-advisory
https://github.com/trusted-remote-execution/trusted-remote-execution/security/advisories/GHSA-95g5-m242-wvhr third-party-advisory

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Details

Published: 2026-11-06
Last updated: 2026-11-07
State: Published
Assigner (CNA): AMZN
Kolun priority: 33 · Low

Exploit prediction (EPSS)

1.62%

Probability of exploitation in 30 days

76.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-78
Improper neutralization of special elements used in an OS command ('OS command injection')