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Report · AWS Security BulletinsAbout CVE-2026-122193Published

CVE-2026-122193: REX

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Authoritative record:CVE-2026-122193· Critical 9.9

Not known to be exploited · CVSS 9.9 Critical · patch available : patch trusted-remote-execution as a priority.

Data as of 6 Nov 2026, 17:39 UTC

CVSS 3.1 base score
9.9Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (AMZN)CVSS 3.19.9
CNA (AMZN)CVSS 4.09.3
Patch
Available
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
AWStrusted-remote-executionAffected
  • =N/A
Fixed in–

AI-suggested

This vulnerability is present only in the example script provided in the Trusted Remote Execution setup guide and not in any shipped REX artifact. Users should avoid using the vulnerable example script as provided. Refer to the official AWS article for the most up-to-date and secure guidance on setting up Trusted Remote Execution.

Description

CVE-2026-122193 is an OS command injection vulnerability found in an example script provided in the Trusted Remote Execution (REX) setup guide. The example script creates AWS Systems Manager (SSM) documents that run scripts on managed instances. Improper handling of input parameters in the example allows a user with permission to invoke the SSM document to supply crafted input, potentially executing unintended OS commands outside the REX sandbox. This issue affects only the example script in the documentation and not any shipped REX artifact versions.

References

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