{
  "document": {
    "aggregate_severity": {
      "text": "Low"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: heap read past bounds in sftp_parse_longname from\n     malicious SFTP longname field\n     - debian/patches/CVE-2026-0968.patch: validate longname pointer and\n       longname_field; bound string walks at NUL; fail if field not found\n     - CVE-2026-0968",
        "title": "Details"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1776361748",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1776361748"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu16.04els/advisories/2026/clsa-2026_1776361748.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-04-16T17:49:43Z",
      "generator": {
        "date": "2026-04-16T17:49:43Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1776361748",
      "initial_release_date": "2026-04-16T17:49:43Z",
      "revision_history": [
        {
          "date": "2026-04-16T17:49:43Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-0968"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Ubuntu 16.04",
                "product": {
                  "name": "Ubuntu 16.04",
                  "product_id": "Ubuntu-16",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Ubuntu"
          }
        ],
        "category": "vendor",
        "name": "Canonical Ltd."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libssh-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                "product": {
                  "name": "libssh-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                  "product_id": "libssh-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/cloudlinux/libssh-4@0.6.3-4.3ubuntu0.6%2Btuxcare.els4?arch=amd64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "libssh-gcrypt-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                "product": {
                  "name": "libssh-gcrypt-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                  "product_id": "libssh-gcrypt-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/cloudlinux/libssh-gcrypt-4@0.6.3-4.3ubuntu0.6%2Btuxcare.els4?arch=amd64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "libssh-gcrypt-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                "product": {
                  "name": "libssh-gcrypt-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                  "product_id": "libssh-gcrypt-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/cloudlinux/libssh-gcrypt-dev@0.6.3-4.3ubuntu0.6%2Btuxcare.els4?arch=amd64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "libssh-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                "product": {
                  "name": "libssh-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                  "product_id": "libssh-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/cloudlinux/libssh-dev@0.6.3-4.3ubuntu0.6%2Btuxcare.els4?arch=amd64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "amd64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "libssh-doc-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.all",
                "product": {
                  "name": "libssh-doc-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.all",
                  "product_id": "libssh-doc-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.all",
                  "product_identification_helper": {
                    "purl": "pkg:deb/cloudlinux/libssh-doc@0.6.3-4.3ubuntu0.6%2Btuxcare.els4?arch=all"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "all"
          }
        ],
        "category": "vendor",
        "name": "CloudLinux"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64 as a component of Ubuntu 16.04",
          "product_id": "Ubuntu-16:libssh-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64"
        },
        "product_reference": "libssh-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
        "relates_to_product_reference": "Ubuntu-16"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh-gcrypt-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64 as a component of Ubuntu 16.04",
          "product_id": "Ubuntu-16:libssh-gcrypt-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64"
        },
        "product_reference": "libssh-gcrypt-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
        "relates_to_product_reference": "Ubuntu-16"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh-gcrypt-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64 as a component of Ubuntu 16.04",
          "product_id": "Ubuntu-16:libssh-gcrypt-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64"
        },
        "product_reference": "libssh-gcrypt-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
        "relates_to_product_reference": "Ubuntu-16"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64 as a component of Ubuntu 16.04",
          "product_id": "Ubuntu-16:libssh-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64"
        },
        "product_reference": "libssh-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
        "relates_to_product_reference": "Ubuntu-16"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "libssh-doc-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.all as a component of Ubuntu 16.04",
          "product_id": "Ubuntu-16:libssh-doc-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.all"
        },
        "product_reference": "libssh-doc-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.all",
        "relates_to_product_reference": "Ubuntu-16"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-0968",
      "cwe": {
        "id": "CWE-476",
        "name": "NULL Pointer Dereference"
      },
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in libssh in which a malicious SFTP (SSH File Transfer Protocol) server can exploit this by sending a malformed 'longname' field within an `SSH_FXP_NAME` message during a file listing operation. This missing null check can lead to reading beyond allocated memory on the heap. This can cause unexpected behavior or lead to a denial of service (DoS) due to application crashes.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Ubuntu-16:libssh-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
          "Ubuntu-16:libssh-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
          "Ubuntu-16:libssh-doc-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.all",
          "Ubuntu-16:libssh-gcrypt-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
          "Ubuntu-16:libssh-gcrypt-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-0968"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/cve/CVE-2026-0968",
          "url": "https://access.redhat.com/security/cve/CVE-2026-0968"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2436982",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436982"
        },
        {
          "category": "external",
          "summary": "https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/",
          "url": "https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/"
        }
      ],
      "release_date": "2026-03-26T21:17:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-04-16T17:49:11.719922Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1776361748",
          "product_ids": [
            "Ubuntu-16:libssh-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
            "Ubuntu-16:libssh-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
            "Ubuntu-16:libssh-doc-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.all",
            "Ubuntu-16:libssh-gcrypt-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
            "Ubuntu-16:libssh-gcrypt-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1776361748"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 3.1,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "products": [
            "Ubuntu-16:libssh-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
            "Ubuntu-16:libssh-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
            "Ubuntu-16:libssh-doc-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.all",
            "Ubuntu-16:libssh-gcrypt-4-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64",
            "Ubuntu-16:libssh-gcrypt-dev-0:0.6.3-4.3ubuntu0.6+tuxcare.els4.amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ]
    }
  ]
}