{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-0967", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-01-14T21:55:01.348Z", "datePublished": "2026-03-26T20:06:30.707Z", "dateUpdated": "2026-03-26T21:09:10.732Z"}, "containers": {"cna": {"title": "Libssh: libssh: denial of service via inefficient regular expression processing", "metrics": [{"other": {"content": {"value": "Low", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_0": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 2.2, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L", "version": "3.0"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client."}], "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 6", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "libssh2", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:enterprise_linux:6"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "libssh2", "defaultStatus": "unaffected", "cpes": ["cpe:/o:redhat:enterprise_linux:7"]}, {"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 OpenShift Container Platform 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "rhcos", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:openshift:4"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-0967", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436981", "name": "RHBZ#2436981", "tags": ["issue-tracking", "x_refsource_REDHAT"]}, {"url": "https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/"}], "datePublic": "2026-02-10T18:47:09.215Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-1333", "description": "Inefficient Regular Expression Complexity", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-1333: Inefficient Regular Expression Complexity", "workarounds": [{"lang": "en", "value": "Avoid using complex patterns in configuration files and known_hosts."}], "timeline": [{"lang": "en", "time": "2026-02-04T23:43:23.869Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-02-10T18:47:09.215Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank Jakub Jelen (libssh) and Kang Yang for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-03-26T21:09:10.732Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

{}

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{"acknowledgement": "Red Hat would like to thank Jakub Jelen (libssh) and Kang Yang for reporting this issue.", "bugzilla": {"description": "libssh: libssh: Denial of Service via inefficient regular expression processing", "id": "2436981", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436981"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.2", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L", "status": "draft"}, "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "value": "Avoid using complex patterns in configuration files and known_hosts."}, "name": "CVE-2026-0967", "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:6", "fix_state": "Not affected", "package_name": "libssh2", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "libssh2", "product_name": "Red Hat Enterprise Linux 7"}, {"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:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-02-10T18:47:09Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-0967\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-0967"], "threat_severity": "Low"}

{"created": "2026-02-12T09:40:07.870043+00:00", "updated": "2026-02-12T09:40:07.870123+00:00", "vendors": ["libssh", "libssh$PRODUCT$libssh"]}