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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,10.3)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "OpenSSH", "source": "cna", "vendor": "OpenBSD"}, "product": "openssh", "vendor": "openbsd"}], "analysis": {"en": {"generated_at": "2026-04-02T22:57:49.030198+00:00", "value": {"mitigation_remediation": ["Update OpenSSH to version 10.3p1 or newer.", "Ensure that the '%' character in ssh_config remains at its default value and that no untrusted usernames are passed as command\u2011line arguments.", "Review SSH configuration files for custom settings that allow untrusted input in command contexts and remove or restrict them.", "Monitor SSH logs for unusual command execution patterns and investigate any anomalies."], "summary": {"action": "Patch Now", "impact": "Command Execution via Untrusted Username"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the OpenBSD OpenSSH implementation, specifically all releases before 10.3. Users who run pre\u201110.3 binaries and provide untrusted user names in command\u2011line contexts with non\u2011default settings in ssh_config are at risk.", "description_and_impact": "In OpenSSH versions prior to 10.3, a flaw allows shell metacharacters included in a user name supplied on the command line to be interpreted as executable commands. This vulnerability permits an attacker to run arbitrary system commands during an SSH session, effectively compromising the host\u2019s confidentiality, integrity, and availability. The weakness aligns with CWE\u2011696, indicating improper handling of user-supplied input leading to command injection.", "risk_and_exploitability": "The CVSS score of 3.6 signals a low severity level, but the necessity for an untrusted username and altered % settings in ssh_config makes exploitation less likely. EPSS data is unavailable and the issue is not listed in the CISA KEV catalog. The likely attack vector is remote via SSH, though the requirement for non\u2011default configuration suggests that real\u2011world exploitation would be constrained unless administrators have permissive settings."}}}}, "created": "2026-04-03T07:32:35.774394+00:00", "updated": "2026-04-03T09:18:26.867531+00:00", "vendors": ["openbsd", "openbsd$PRODUCT$openssh"]}