CVE-2026-35386

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{"bugzilla": {"description": "OpenSSH: OpenSSH: Arbitrary command execution via shell metacharacters in username", "id": "2454506", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454506"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-78", "details": ["In OpenSSH before 10.3, command execution can occur via shell metacharacters in a username within a command line. This requires a scenario where the username on the command line is untrusted, and also requires a non-default configurations of % in ssh_config.", "A flaw was found in OpenSSH. This vulnerability allows a remote attacker to achieve arbitrary command execution by injecting shell metacharacters into a username provided on the command line. Exploitation requires an untrusted username and a non-default configuration of the '%' character in `ssh_config`."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-35386", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-04-02T16:44:27Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-35386\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-35386\nhttps://marc.info/?l=openssh-unix-dev&m=177513443901484&w=2\nhttps://www.openssh.org/releasenotes.html#10.3p1\nhttps://www.openwall.com/lists/oss-security/2026/04/02/3"], "threat_severity": "Low"}

{"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": "2026-04-04T03:57:51.867606+00:00", "value": {"mitigation_remediation": ["Upgrade OpenSSH to version 10.3 or later.", "Ensure that ssh_config\u2019s percent handling remains at its default setting to prevent shell metacharacter expansion.", "Verify that usernames used on the command line are sanitized or avoid passing untrusted usernames altogether."], "summary": {"action": "Patch", "impact": "Arbitrary command execution via username shell metacharacters"}, "threat_synthesis": {"affected_systems": "OpenBSD OpenSSH releases before 10.3 are affected. Any installation of OpenSSH prior to 10.3 that compiles from source or is distributed as a system package is vulnerable. Users running earlier OpenSSH versions cannot safely use untrusted usernames passed via the SSH command line without applying the patch.", "description_and_impact": "The vulnerability allows a malicious user to execute arbitrary shell commands when the SSH client supplies an untrusted username that contains shell metacharacters and the server\u2019s ssh_config has the percent character (% ) remapping enabled. OpenSSH processes the username in a way that causes the shell to interpret the metacharacters, leading to command execution. This can compromise system integrity and confidentiality if the attacker can construct a malicious username.", "risk_and_exploitability": "The CVSS score of 3.6 indicates low severity under current scoring, and the EPSS score below 1% suggests a very low likelihood of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog. Attackers must supply an untrusted username and have ssh_config configured with a non\u2011default % mapping, which limits the attack surface. However, if those conditions are met, command execution can be achieved, potentially allowing privilege escalation or data exfiltration."}}}}, "created": "2026-04-03T07:32:35.774394+00:00", "updated": "2026-04-07T07:55:58.288992+00:00", "vendors": ["openbsd", "openbsd$PRODUCT$openssh"]}