Vulnerability-Lookup

GHSA-HQVF-45JJ-MCCQ

Vulnerability from github – Published: 2026-08-06 20:15 – Updated: 2026-08-06 20:15

Summary

AWS CLI: Disabled SSH host key verification in Amazon AWS CLI EMR helper commands

Details

Summary

The AWS Command Line Interface (AWS CLI) is a unified tool to manage AWS services from the command line. An issue exists where the EMR SSH helper commands (aws emr ssh, aws emr socks, aws emr put, aws emr get) passed StrictHostKeyChecking=no to the underlying SSH client, disabling host key verification.

Impact

A network-positioned actor could perform a man-in-the-middle action to intercept SSH sessions and file transfers between the client and EMR cluster instances. Successful exploitation requires the actor to have network access on the path between the client machine and the EMR cluster endpoint. This could result in full visibility of commands executed, files transferred, and credentials passed over the SSH session.

Impacted versions: AWS CLI v1 <= 1.45.27, AWS CLI v2 <= 2.35.2

Patches

This issue has been addressed in AWS CLI v1 version 1.45.28 and AWS CLI v2 version 2.35.3. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

Workarounds

There is no workaround. The insecure SSH option was hardcoded and could not be overridden by the user.

References

If you have any questions or comments about this advisory, we ask that you contact AWS Security via our vulnerability reporting page or directly via email to aws-security@amazon.com. Please do not create a public GitHub issue.

Acknowledgement

We would like to thank Ali Sunbul for collaborating on this issue through the coordinated vulnerability disclosure process.

Severity

6.8 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.45.27"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "awscli"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.45.28"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-18654"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-322"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-06T20:15:30Z",
    "nvd_published_at": "2026-08-03T20:17:17Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nThe AWS Command Line Interface (AWS CLI) is a unified tool to manage AWS services from the command line. An issue exists where the EMR SSH helper commands (`aws emr ssh`, `aws emr socks`, `aws emr put`, `aws emr get`) passed `StrictHostKeyChecking=no` to the underlying SSH client, disabling host key verification.\n\n### Impact\nA network-positioned actor could perform a man-in-the-middle action to intercept SSH sessions and file transfers between the client and EMR cluster instances. Successful exploitation requires the actor to have network access on the path between the client machine and the EMR cluster endpoint. This could result in full visibility of commands executed, files transferred, and credentials passed over the SSH session.\n\nImpacted versions: AWS CLI v1 \u003c= 1.45.27, AWS CLI v2 \u003c= 2.35.2\n\n### Patches\nThis issue has been addressed in AWS CLI v1 version 1.45.28 and AWS CLI v2 version 2.35.3. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.\n\n### Workarounds\nThere is no workaround. The insecure SSH option was hardcoded and could not be overridden by the user.\n\n### References\nIf you have any questions or comments about this advisory, we ask that you contact AWS Security via our [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.\n\n### Acknowledgement\nWe would like to thank Ali Sunbul for collaborating on this issue through the coordinated vulnerability disclosure process.",
  "id": "GHSA-hqvf-45jj-mccq",
  "modified": "2026-08-06T20:15:30Z",
  "published": "2026-08-06T20:15:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/aws/aws-cli/security/advisories/GHSA-hqvf-45jj-mccq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18654"
    },
    {
      "type": "WEB",
      "url": "https://aws.amazon.com/security/security-bulletins/2026-071-aws"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/aws/aws-cli"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aws/aws-cli/blob/develop/CHANGELOG.rst"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aws/aws-cli/blob/v2/CHANGELOG.rst"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "AWS CLI: Disabled SSH host key verification in Amazon AWS CLI EMR helper commands"
}

CVE-2026-18654 (GCVE-0-2026-18654)

Vulnerability from cvelistv5 – Published: 2026-08-03 19:38 – Updated: 2026-08-04 19:32

Title

Disabled SSH host key verification in Amazon AWS CLI EMR helper commands

Summary

Key exchange without entity authentication in the EMR SSH helper commands in Amazon AWS CLI before 1.45.28 and AWS CLI v2 before 2.35.3 might allow man-in-the-middle attackers to intercept SSHsessions and file transfers via network positioning between the client and the EMR cluster endpoint. To remediate this issue, users should upgrade to AWS CLI v1 1.45.28 or later, or AWS CLI v2 2.35.3 or later.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

6.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-322 - Key exchange without entity authentication

Assigner

AMZN

References

4 references

URL	Tags
https://github.com/aws/aws-cli/blob/develop/CHANG…	patchrelease-notes
https://github.com/aws/aws-cli/blob/v2/CHANGELOG.rst	patchrelease-notes
https://aws.amazon.com/security/security-bulletin…	vendor-advisory
https://github.com/aws/aws-cli/security/advisorie…	release-notes

Impacted products

1 product

Vendor	Product	Version
AWS	aws-cli	Affected: 0 , ≤ 1.45.27 (custom) Affected: 0 , ≤ 2.35.2 (custom)

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-HQVF-45JJ-MCCQ

Summary

Impact

Patches

Workarounds

References

Acknowledgement

CVE-2026-18654 (GCVE-0-2026-18654)

Tags

Sightings

Nomenclature