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vuln-cve/data/2026/0xxx/CVE-2026-0966.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-0966",
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"state": "PUBLISHED",
"assignerShortName": "redhat",
"dateReserved": "2026-01-14T21:54:59.132Z",
"datePublished": "2026-03-26T20:06:28.313Z",
"dateUpdated": "2026-11-05T16:11:44.402Z"
},
"containers": {
"cna": {
"title": "Libssh: libssh: denial of service via zero-length input in ssh_get_hexa()",
"metrics": [
{
"other": {
"content": {
"value": "Moderate",
"namespace": "https://access.redhat.com/security/updates/classification/"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_0": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H",
"version": "3.0"
},
"format": "CVSS"
}
],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in libssh. The API function `ssh_get_hexa()` is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is set to `SSH_LOG_PACKET (3)` or higher. Successful exploitation could lead to a self-Denial of Service of the per-connection daemon process."
}
],
"affected": [
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 10",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "libssh",
"defaultStatus": "affected",
"versions": [
{
"version": "0:0.12.0-2.el10",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
],
"cpes": [
"cpe:/o:redhat:enterprise_linux:10.2"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "libssh",
"defaultStatus": "affected",
"versions": [
{
"version": "0:0.10.4-18.el9",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
],
"cpes": [
"cpe:/a:redhat:enterprise_linux:9::appstream",
"cpe:/o:redhat:enterprise_linux:9::baseos"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "libssh",
"defaultStatus": "affected",
"versions": [
{
"version": "0:0.10.4-18.el9",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
],
"cpes": [
"cpe:/a:redhat:enterprise_linux:9::appstream",
"cpe:/o:redhat:enterprise_linux:9::baseos"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Hardened Images",
"collectionURL": "https://catalog.redhat.com/software/containers/",
"packageName": "libssh-main",
"defaultStatus": "affected",
"versions": [
{
"version": "0.12.0-1.1.hum1",
"lessThan": "*",
"versionType": "rpm",
"status": "unaffected"
}
],
"cpes": [
"cpe:/a:redhat:hummingbird:1"
]
},
{
"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:rhel_els: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:rhel_els: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:/a:redhat:enterprise_linux:8"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Hardened Images",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "libssh2",
"defaultStatus": "unaffected",
"cpes": [
"cpe:/a:redhat:hummingbird:1"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "openshift/ose-rhel-coreos-8",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:openshift:4"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat OpenShift Container Platform 4",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "openshift/ose-rhel-coreos-9",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:openshift:4"
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:18160",
"name": "RHSA-2026:18160",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
]
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:18683",
"name": "RHSA-2026:18683",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
]
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:7067",
"name": "RHSA-2026:7067",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
]
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-0966",
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
]
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2433121",
"name": "RHBZ#2433121",
"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": "2026-02-10T18:47:15.531Z",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-124",
"description": "Buffer Underwrite",
"lang": "en",
"type": "CWE"
}
]
}
],
"x_redhatCweChain": "CWE-124: Buffer Underwrite",
"workarounds": [
{
"lang": "en",
"value": "Applications using libssh should avoid passing zero-length input to ssh_get_hexa(), ssh_get_fingerprint_hash(), and ssh_print_hexa().\n\nFor the remotely reachable GSSAPI authentication path, disable GSSAPI authentication in the affected libssh-based application if it is not required, or configure that application's libssh logging verbosity below SSH_LOG_PACKET (3). These measures address the GSSAPI logging path; they do not prevent other callers from passing zero-length input to the affected functions.\n\nConfiguration and any required restart depend on the application using libssh. Changing the host's OpenSSH sshd_config or restarting the OpenSSH sshd service is not a general mitigation for applications using libssh.\n\nApply the relevant vendor update containing the fix. Upstream fixed this issue in libssh 0.11.4 and 0.12.0; distribution packages may include a backported fix."
}
],
"timeline": [
{
"lang": "en",
"time": "2026-01-26T23:14:46.617Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-02-10T18:47:15.531Z",
"value": "Made public."
}
],
"credits": [
{
"lang": "en",
"value": "Red Hat would like to thank Jakub Jelen (libssh), Jun Xu, Kang Yang, and Yunhang Zhang for reporting this issue."
}
],
"providerMetadata": {
"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"shortName": "redhat",
"dateUpdated": "2026-11-05T16:11:44.402Z"
},
"x_generator": {
"engine": "cvelib 1.8.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-03-27T19:52:22.819171Z",
"id": "CVE-2026-0966",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-03-27T20:01:45.907Z"
}
}
]
}
}
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