EUVD-2026-77190
GHSA-2w8j-c6w5-f5gp
Severity by source
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
MITM requires network positioning (AC:H); bypassed host key validation exposes SSH session content including credentials (C:L) and enables session hijacking to a rogue endpoint (I:L).
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Improper SSH host key validation in andreashappe/cochise through version 0.4.1 allows a network-positioned attacker to perform Man-in-the-Middle attacks against SSH sessions established by the tool. The vulnerable component is the asyncssh.connect() call in src/cochise/ssh_connection.py, where the SSH Host Key Handler fails to verify server host keys, enabling silent impersonation of target SSH hosts. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to achieve a Man-in-the-Middle network position between the system running cochise and its target SSH server (e.g., via ARP poisoning on a LAN, DNS spoofing, rogue gateway, or BGP hijacking on a WAN path). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.3 with AC:H correctly captures the key limiting factor: exploitation requires an attacker to occupy a Man-in-the-Middle network position, which is not trivially achievable on most networks. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch has been identified at time of analysis; the maintainer had not responded to the responsible disclosure issue at the time of publication. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-295 – Improper Certificate Validation
View allSame technique Information Disclosure
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External POC / Exploit Code
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