Amazon AWS CLI up to 1.45.27/2.35.2 channel accessible

Summaryinfo

A vulnerability, which was classified as critical, was found in Amazon AWS CLI up to 1.45.27/2.35.2. Affected by this vulnerability is an unknown functionality. Executing a manipulation can lead to channel accessible. This vulnerability is registered as CVE-2026-18654. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in Amazon AWS CLI up to 1.45.27/2.35.2. This vulnerability affects some unknown functionality. The manipulation with an unknown input leads to a channel accessible vulnerability. The CWE definition for the vulnerability is CWE-300. The product does not adequately verify the identity of actors at both ends of a communication channel, or does not adequately ensure the integrity of the channel, in a way that allows the channel to be accessed or influenced by an actor that is not an endpoint. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-18654 since 08/03/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1557.

Upgrading to version 1.45.28 or 2.35.3 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Amazon

Name

• AWS CLI

Version

• 1.45.0
• 1.45.1
• 1.45.2
• 1.45.3
• 1.45.4
• 1.45.5
• 1.45.6
• 1.45.7
• 1.45.8
• 1.45.9
• 1.45.10
• 1.45.11
• 1.45.12
• 1.45.13
• 1.45.14
• 1.45.15
• 1.45.16
• 1.45.17
• 1.45.18
• 1.45.19
• 1.45.20
• 1.45.21
• 1.45.22
• 1.45.23
• 1.45.24
• 1.45.25
• 1.45.26
• 1.45.27
• 2.35.0
• 2.35.1
• 2.35.2

License

• commercial

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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CVSSv3info

CVSSv2info

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Threat Intelligenceinfo

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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