CVE-2026-90623

andreashappe cochise SSH Host Key ssh_connection.py asyncssh.connect certificate validation

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Published Sep 14, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Description
A weakness has been identified in andreashappe cochise up to 0.4.1. Affected is the function asyncssh.connect of the file src/cochise/ssh_connection.py of the component SSH Host Key Handler. Executing a manipulation can lead to improper certificate validation. The attack may be launched remotely. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

Analysis

AI-generated

Technical impact

The vulnerability is an improper certificate validation flaw in the asyncssh.connect function within Cochise's SSH Host Key Handler. By manipulating input, an attacker can trick the component into accepting forged or unauthorized SSH host certificates, thereby bypassing authentication and enabling unauthorized access to services. This issue falls under CWE-287 and CWE-295, representing authentication bypass and improper verification of cryptographic signatures. The CVSS score of 6.3 indicates a moderate severity that can compromise confidentiality and integrity of data when exploited.

Affected Systems

Vendor: andreashappe; Product: Cochise. All releases up to version 0.4.1 are affected. The flaw resides in the SSH Host Key Handler component of the asyncssh.connect function affected revision and apply updates accordingly.

Risk and Exploitability

The attack can be launched remotely and requires a high level of complexity, but the public exploitation effort is described as difficult. With a CVSS score of 6.3, the risk is moderate; however, the potential for unauthorized access encourages swift remediation. Public exploits are available, and the vulnerability is The EPSS score of 0.00264 indicates a very low probability of exploitation, but the presence of a public exploit means a non‑zero risk if systems remain vulnerable.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade to the latest version of Cochise that addresses the certificate validation flaw or use a patched release newer than 0.4.1.
  • Configure the SSH client or application to enforce strict host key verification, rejecting any certificates that do not match known fingerprints.
  • Monitor SSH authentication logs for anomalous or repeated failed host key checks and promptly investigate any suspicious activity.

Generated by OpenCVE AI on September 15, 2026 at 15:29 UTC.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}
Type Values Removed Values Added
Description A weakness has been identified in andreashappe cochise up to 0.4.1. Affected is the function asyncssh.connect of the file src/cochise/ssh_connection.py of the component SSH Host Key Handler. Executing a manipulation can lead to improper certificate validation. The attack may be launched remotely. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
Title andreashappe cochise SSH Host Key ssh_connection.py asyncssh.connect certificate validation
First Time appeared Andreashappe
Andreashappe cochise
Weaknesses CWE-287
CWE-295
CPEs cpe:2.3:a:andreashappe:cochise:*:*:*:*:*:*:*:*
Vendors & Products Andreashappe
Andreashappe cochise
References
Metrics cvssV2_0

{'score': 2.6, 'vector': 'AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 3.7, 'vector': 'CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P'}
Weaknesses
  • CWE-287

    Improper Authentication

  • CWE-295

    Improper Certificate Validation

Sources

Status
PUBLISHED
Assigner
VulDB
Published
Updated
Sep 14, 2026, 3:48 PM
Reserved
Sep 12, 2026, 8:30 PM

View source JSON

Updated
Sep 14, 2026, 3:48 PM

JSON

Status
Deferred
Published
Sep 14, 2026, 4:16 AM
Modified
Sep 14, 2026, 8:56 PM

View source JSON

No data.

Updated
Sep 15, 2026, 3:30 PM

JSON