{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59846", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-07-07T15:40:24.561Z", "datePublished": "2026-07-21T12:55:56.532Z", "dateUpdated": "2026-07-21T12:55:56.532Z"}, "containers": {"cna": {"title": "Libssh: libssh: information disclosure via proxycommand %r username expansion", "metrics": [{"other": {"content": {"value": "Low", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 3.9, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in libssh. A malicious username expanded through %r in ProxyCommand handling can inject shell metacharacters, exposing environment variables and causing unintended shell behavior."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "libssh", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:10"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "libssh", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:8"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "libssh", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:9"]}, {"vendor": "Red Hat", "product": "Red Hat Hardened Images", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "libssh", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:hummingbird:1"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-59846", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498179", "name": "RHBZ#2498179", "tags": ["issue-tracking", "x_refsource_REDHAT"]}], "datePublic": "2026-07-21T12:46:04.558Z", "workarounds": [{"lang": "en", "value": "Make sure you are not executing connections with untrusted username inputs."}], "timeline": [{"lang": "en", "time": "2026-04-29T10:03:47.442Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-07-21T12:46:04.558Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank Mikhail Ilin and Saransh Rana for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-07-21T12:55:56.532Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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{"acknowledgement": "Red Hat would like to thank Mikhail Ilin and Saransh Rana for reporting this issue.", "bugzilla": {"description": "libssh: libssh: information disclosure via ProxyCommand %r username expansion", "id": "2498179", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498179"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.9", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "status": "draft"}, "details": ["A flaw was found in libssh. A malicious username expanded through %r in ProxyCommand handling can inject shell metacharacters, exposing environment variables and causing unintended shell behavior."], "mitigation": {"lang": "en:us", "value": "Make sure you are not executing connections with untrusted username inputs."}, "name": "CVE-2026-59846", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "libssh", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "libssh", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "libssh", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "impact": "low", "package_name": "libssh", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-21T12:46:04Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-59846\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-59846"], "threat_severity": "Low"}

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