CVE-2026-44467: CWE-297: Improper Validation of Certificate with Host Mismatch in anthropics claude-code
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.
AI Analysis
Technical Summary
The vulnerability in anthropics claude-code Desktop app (versions >=1.2581.0 and <1.4304.0) involves improper validation of SSH server certificates during remote development sessions. Specifically, the app only checks for the existence of the hostname in the ~/.ssh/known_hosts file but does not verify that the server's presented SSH host key matches the stored key. This weakness (CWE-297) enables a man-in-the-middle attack if an attacker can intercept network traffic and the hostname is already known to the client. The issue is resolved in version 1.4304.0.
Potential Impact
An attacker positioned on the network path (e.g., via ARP spoofing, rogue Wi-Fi, or DNS poisoning) can present a fraudulent SSH host key to the client, which will be accepted without warning if the hostname exists in the known_hosts file. This allows interception and manipulation of remote development sessions, compromising confidentiality and integrity of the SSH connection. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
This vulnerability is fixed in anthropics claude-code Desktop app version 1.4304.0. Users should upgrade to version 1.4304.0 or later to remediate this issue. Since this is not a cloud service, remediation depends on applying the official update. Patch status is confirmed by the vendor advisory stating the fix is included in version 1.4304.0.
CVE-2026-44467: CWE-297: Improper Validation of Certificate with Host Mismatch in anthropics claude-code
Description
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.
CVSS v4.0
Score 7.4high
Affected software
pkg:github/anthropics/claude-codeRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in anthropics claude-code Desktop app (versions >=1.2581.0 and <1.4304.0) involves improper validation of SSH server certificates during remote development sessions. Specifically, the app only checks for the existence of the hostname in the ~/.ssh/known_hosts file but does not verify that the server's presented SSH host key matches the stored key. This weakness (CWE-297) enables a man-in-the-middle attack if an attacker can intercept network traffic and the hostname is already known to the client. The issue is resolved in version 1.4304.0.
Potential Impact
An attacker positioned on the network path (e.g., via ARP spoofing, rogue Wi-Fi, or DNS poisoning) can present a fraudulent SSH host key to the client, which will be accepted without warning if the hostname exists in the known_hosts file. This allows interception and manipulation of remote development sessions, compromising confidentiality and integrity of the SSH connection. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
This vulnerability is fixed in anthropics claude-code Desktop app version 1.4304.0. Users should upgrade to version 1.4304.0 or later to remediate this issue. Since this is not a cloud service, remediation depends on applying the official update. Patch status is confirmed by the vendor advisory stating the fix is included in version 1.4304.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-06T15:49:25.193Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a04a508cbff5d8610e80450
Added to database: 05/13/2026, 16:21:28 UTC
Last enriched: 05/20/2026, 18:44:10 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 72
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