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CVE-2026-122193

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

Products / packages AWS trusted-remote-execution

Published

Share

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 08/11/2026, 02:55:30 UTC
AMZN · CVSS:3.1 · 9.9
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AMZN · CVSS:4.0 · 9.3
Assessment vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:L/SA:N
The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

critical9.9

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

Trusted Remote Execution (REX) before 2026-07-28 has an OS command injection weakness, potentially allowing authenticated remote users to execute arbitrary commands as root. The issue affects example SSM documents. An attacker needs permission to invoke the Rex-RO or Rex-RW SSM document.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

AWS · AMZN

trusted-remote-execution

1 range
AMZN version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

N/A

custom versions

unaffected

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher 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

2 sources
aws.amazon.com/security/security-bulletins/2026-173-aws/
Vendor advisoryAMZN
trusted-remote-execution/trusted-remote-execution · security/advisories/GHSA-95g5-m242-wvhr
Security advisoryAMZN

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-122193

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-78 ↗

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

AMZN

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

AMZN · platform conditions

Any condition may hold

Any condition may hold

Vulnerable product

cpe:2.3:a:aws:trusted-remote-execution:n_a:*:*:*:*:*:*:*
Original applicability statements
[
  {
    "operator": "OR",
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:aws:trusted-remote-execution:n_a:*:*:*:*:*:*:*"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
AMZN

Assigning organization

2026-11-06
CISA-ADP

Additional data publisher

2026-11-06

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-122193

    Observed 2026-11-06T20:47:29.331Z · upstream updated 2026-11-06T20:35:22.445Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-06T20:35:18.533469Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.