FKIE_CVE-2026-0967

Vulnerability from fkie_nvd - Published: 2026-03-26 21:17 - Updated: 2026-04-02 17:28
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Summary
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.
References
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2026-0967Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2436981Third Party Advisory
secalert@redhat.comhttps://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/Release Notes
Impacted products
Vendor Product Version
libssh libssh *
redhat enterprise_linux 9.0
redhat enterprise_linux 10.0
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2366D711-FD0B-4A04-92BA-DE6DA0ED1BCF",
              "versionEndIncluding": "0.11.3",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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."
    },
    {
      "lang": "es",
      "value": "Se encontr\u00f3 una vulnerabilidad en libssh. Un atacante remoto, al controlar los archivos de configuraci\u00f3n del cliente o los archivos known_hosts, podr\u00eda crear nombres de host espec\u00edficos que, al ser procesados por la funci\u00f3n `match_pattern()`, pueden llevar a un retroceso ineficiente de expresiones regulares. Esto puede causar tiempos de espera y agotamiento de recursos, lo que resulta en una denegaci\u00f3n de servicio (DoS) para el cliente."
    }
  ],
  "id": "CVE-2026-0967",
  "lastModified": "2026-04-02T17:28:27.853",
  "metrics": {
    "cvssMetricV30": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 0.8,
        "impactScore": 1.4,
        "source": "secalert@redhat.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-26T21:17:00.970",
  "references": [
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://access.redhat.com/security/cve/CVE-2026-0967"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436981"
    },
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}


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