How severe is CVE-2026-18654?

CVE-2026-18654 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-18654 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-18654?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-18654 published?

CVE-2026-18654 was published on 2026-08-03 and last updated on 2026-08-04.

CVE-2026-18654

CVE-2026-18654 is a medium-severity vulnerability with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-322.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v4: 6.9
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-322
Published: 2026-08-03
Last modified: 2026-08-04

Description

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.

Frequently asked questions

What is CVE-2026-18654?: 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.
How severe is CVE-2026-18654?: CVE-2026-18654 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-18654 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-18654?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-18654 published?: CVE-2026-18654 was published on 2026-08-03 and last updated on 2026-08-04.

References

Other CWE-322 vulnerabilities

CVE-2026-1709 — Critical (CVSS 9.4): A flaw was found in Keylime. The Keylime registrar, since version 7.12.0, does not enforce client-side Transport Layer…
CVE-2026-11745 — High (CVSS 8.8): A vulnerability has been identified in centraldogma-server-mirror-git versions prior to 0.84.0, where the Git mirror…
CVE-2025-13914 — High (CVSS 8.7): A Key Exchange without Entity Authentication vulnerability in the SSH implementation of Juniper Networks Apstra allows…
CVE-2025-20163 — High (CVSS 8.7): A vulnerability in the SSH implementation of Cisco Nexus Dashboard Fabric Controller (NDFC) could allow an…
CVE-2024-47519 — High (CVSS 8.3): Backup uploads to ETM subject to man-in-the-middle interception
CVE-2026-58065 — High (CVSS 8.1): The Apache Airflow Git provider runs its git-over-SSH operations with `StrictHostKeyChecking=no` by default, disabling…

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