Vulnerability in SSH Host Key Handler of AndreasHappe Cochise
CVE-2026-90623

6.3MEDIUM

Key Information:

Vendor

Andreashappe

Status
Cochise
Vendor
CVE Published:
14 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-90623?

A vulnerability has been discovered in the AndreasHappe Cochise project, specifically within the SSH Host Key Handler component. This issue arises in the asyncssh.connect function, located in src/cochise/ssh_connection.py, allowing for improper validation of SSH host keys. An attacker could exploit this weakness, which requires a sophisticated approach, to potentially bypass authentication mechanisms when connecting to SSH servers. Given the complexity of the attack method, it remains a significant concern, especially since the exploit code has been made publicly available. Despite being alerted about this issue through an early report, there has been no response from the project's developers regarding a fix.

Affected Version(s)

cochise 0.4.0

cochise 0.4.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-90623 - Proof of Concept

References

https://vuldb.com/vuln/403205
vdb-entrytechnical-description
https://vuldb.com/vuln/403205/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-90623
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ez-lbz (VulDB User)
VulDB CNA Team
.