CWE-322

Key Exchange without Entity Authentication

The product performs a key exchange with an actor without verifying the identity of that actor.

CVE-2026-33697 (GCVE-0-2026-33697)

Vulnerability from cvelistv5 – Published: 2026-03-26 23:34 – Updated: 2026-03-27 19:59
VLAI
Title
CoCoS attested TLS is vulnerable to relay attacks via extracted ephemeral TLS keys
Summary
Cocos AI is a confidential computing system for AI. The current implementation of attested TLS (aTLS) in CoCoS is vulnerable to a relay attack affecting all versions from v0.4.0 through v0.8.2. This vulnerability is present in both the AMD SEV-SNP and Intel TDX deployment targets supported by CoCoS. In the affected design, an attacker may be able to extract the ephemeral TLS private key used during the intra-handshake attestation. Because the attestation evidence is bound to the ephemeral key but not to the TLS channel, possession of that key is sufficient to relay or divert the attested TLS session. A client will accept the connection under false assumptions about the endpoint it is communicating with — the attestation report cannot distinguish the genuine attested service from the attacker's relay. This undermines the intended authentication guarantees of attested TLS. A successful attack may allow an attacker to impersonate an attested CoCoS service and access data or operations that the client intended to send only to the genuine attested endpoint. Exploitation requires the attacker to first extract the ephemeral TLS private key, which is possible through physical access to the server hardware, transient execution attacks, or side-channel attacks. Note that the aTLS implementation was fully redesigned in v0.7.0, but the redesign does not address this vulnerability. The relay attack weakness is architectural and affects all releases in the v0.4.0–v0.8.2 range. This vulnerability class was formally analyzed and demonstrated across multiple attested TLS implementations, including CoCoS, by researchers whose findings were disclosed to the IETF TLS Working Group. Formal verification was conducted using ProVerif. As of time of publication, there is no patch available. No complete workaround is available. The following hardening measures reduce but do not eliminate the risk: Keep TEE firmware and microcode up to date to reduce the key-extraction surface; define strict attestation policies that validate all available report fields, including firmware versions, TCB levels, and platform configuration registers; and/or enable mutual aTLS with CA-signed certificates where deployment architecture permits.
Severity
7.5 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
CWE
  • CWE-322 - Key Exchange without Entity Authentication
  • CWE-346 - Origin Validation Error
Assigner
References
Impacted products
Vendor Product Version
ultravioletrs cocos Affected: >= 0.4.0, < 0.8.2
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CVE-2026-44467 (GCVE-0-2026-44467)

Vulnerability from cvelistv5 – Published: 2026-05-13 15:40 – Updated: 2026-05-14 18:29
VLAI
Title
Claude Desktop: SSH Host Key Verification Bypass Allows Man-in-the-Middle Attack on Remote Sessions
Summary
The Claude Desktop app gives you Claude Code with a graphical interface built for running multiple sessions side by side. From 1.2581.0 to before 1.4304.0, Claude Desktop's SSH remote development feature verified only whether a hostname existed in ~/.ssh/known_hosts without comparing the server's presented host key against the stored key. This allowed a network-positioned attacker to present an arbitrary SSH host key and have the connection silently accepted, enabling a man-in-the-middle attack on remote development sessions. Successful exploitation required the attacker to be in a network position to intercept SSH traffic (e.g., via ARP spoofing, rogue Wi-Fi, or DNS poisoning) and the target hostname to already have an entry in the victim's known_hosts file. This vulnerability is fixed in 1.4304.0.
Severity
7.4 (High)
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
  • CWE-322 - Key Exchange without Entity Authentication
Assigner
References
Impacted products
Vendor Product Version
anthropics claude-code Affected: >= 1.2581.0, < 1.4304.0
Create a notification for this product.
Show details on NVD website
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CVE-2026-45361 (GCVE-0-2026-45361)

Vulnerability from cvelistv5 – Published: 2026-05-25 09:34 – Updated: 2026-05-26 14:34
VLAI
Title
Apache Airflow Google provider: SSH host key verification disabled in ComputeEngineSSHHook (paramiko AutoAddPolicy default)
Summary
Apache Airflow providers-google's `ComputeEngineSSHHook` disables SSH host-key verification by default, exposing SSH traffic between an Airflow worker and a Compute Engine VM to in-path network attackers who can intercept or modify the session. Users are advised to upgrade to `apache-airflow-providers-google` 22.0.0 or later.
Severity
No CVSS data available.
CWE
  • CWE-322 - (Key Exchange without Entity Authentication)
Assigner
References
Impacted products
Credits
Jarek Potiuk
Show details on NVD website
To clipboard 

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Mitigation

Phase: Architecture and Design

Description:

  • Ensure that proper authentication is included in the system design.
Mitigation

Phase: Implementation

Description:

  • Understand and properly implement all checks necessary to ensure the identity of entities involved in encrypted communications.

No CAPEC attack patterns related to this CWE.

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