{
  "document": {
    "aggregate_severity": {
      "text": "Important"
    },
    "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": "CVE-2026-3731: fix out-of-bounds read in sftp_extensions_get_name and\n  sftp_extensions_get_data when idx equals the extension count",
        "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-2026:1773830791",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1773830791"
      },
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        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/almalinux9.2esu/advisories/2026/clsa-2026_1773830791.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-03-18T10:47:05Z",
      "generator": {
        "date": "2026-03-18T10:47:05Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1773830791",
      "initial_release_date": "2026-03-18T10:47:05Z",
      "revision_history": [
        {
          "date": "2026-03-18T10:47:05Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "libssh: Fix of CVE-2026-3731"
  },
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        "name": "AlmaLinux OS Foundation"
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      },
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        },
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  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-3731",
      "cwe": {
        "id": "CWE-119",
        "name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
      },
      "notes": [
        {
          "category": "description",
          "text": "A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.",
          "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": [
          "AlmaLinux-9.2:libssh-0:0.10.4-8.el9.tuxcare.els7.i686",
          "AlmaLinux-9.2:libssh-0:0.10.4-8.el9.tuxcare.els7.x86_64",
          "AlmaLinux-9.2:libssh-config-0:0.10.4-8.el9.tuxcare.els7.noarch",
          "AlmaLinux-9.2:libssh-devel-0:0.10.4-8.el9.tuxcare.els7.i686",
          "AlmaLinux-9.2:libssh-devel-0:0.10.4-8.el9.tuxcare.els7.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-3731"
        },
        {
          "category": "external",
          "summary": "https://gitlab.com/libssh/libssh-mirror/-/commit/855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60",
          "url": "https://gitlab.com/libssh/libssh-mirror/-/commit/855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60"
        },
        {
          "category": "external",
          "summary": "https://vuldb.com/?ctiid.349709",
          "url": "https://vuldb.com/?ctiid.349709"
        },
        {
          "category": "external",
          "summary": "https://vuldb.com/?id.349709",
          "url": "https://vuldb.com/?id.349709"
        },
        {
          "category": "external",
          "summary": "https://vuldb.com/?submit.767120",
          "url": "https://vuldb.com/?submit.767120"
        },
        {
          "category": "external",
          "summary": "https://www.libssh.org/files/0.12/libssh-0.12.0.tar.xz",
          "url": "https://www.libssh.org/files/0.12/libssh-0.12.0.tar.xz"
        },
        {
          "category": "external",
          "summary": "https://www.libssh.org/security/advisories/libssh-2026-sftp-extensions.txt",
          "url": "https://www.libssh.org/security/advisories/libssh-2026-sftp-extensions.txt"
        }
      ],
      "release_date": "2026-03-08T11:15:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-03-18T10:46:34.541992Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1773830791",
          "product_ids": [
            "AlmaLinux-9.2:libssh-0:0.10.4-8.el9.tuxcare.els7.i686",
            "AlmaLinux-9.2:libssh-0:0.10.4-8.el9.tuxcare.els7.x86_64",
            "AlmaLinux-9.2:libssh-config-0:0.10.4-8.el9.tuxcare.els7.noarch",
            "AlmaLinux-9.2:libssh-devel-0:0.10.4-8.el9.tuxcare.els7.i686",
            "AlmaLinux-9.2:libssh-devel-0:0.10.4-8.el9.tuxcare.els7.x86_64"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1773830791"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "AlmaLinux-9.2:libssh-0:0.10.4-8.el9.tuxcare.els7.i686",
            "AlmaLinux-9.2:libssh-0:0.10.4-8.el9.tuxcare.els7.x86_64",
            "AlmaLinux-9.2:libssh-config-0:0.10.4-8.el9.tuxcare.els7.noarch",
            "AlmaLinux-9.2:libssh-devel-0:0.10.4-8.el9.tuxcare.els7.i686",
            "AlmaLinux-9.2:libssh-devel-0:0.10.4-8.el9.tuxcare.els7.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}