{
  "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-2026-34479: fix Log4j1XmlLayout invalid XML 1.0 character escape",
        "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-2026:1779124827",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1779124827"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/tuxcare9.6esu/advisories/2026/clsa-2026_1779124827.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-05-18T17:21:57Z",
      "generator": {
        "date": "2026-05-18T17:21:57Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1779124827",
      "initial_release_date": "2026-05-18T17:21:57Z",
      "revision_history": [
        {
          "date": "2026-05-18T17:21:57Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "log4j: Fix of CVE-2026-34479"
  },
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          "product_id": "Rocky Linux-9.6:log4j-0:2.17.2-1.el9.tuxcare.els1.noarch"
        },
        "product_reference": "log4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
        "relates_to_product_reference": "Rocky Linux-9.6"
      },
      {
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          "name": "log4j-web-0:2.17.2-1.el9.tuxcare.els1.noarch as a component of Rocky Linux 9.6",
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        },
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        "relates_to_product_reference": "Rocky Linux-9.6"
      },
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        },
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        "relates_to_product_reference": "Rocky Linux-9.6"
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        },
        "product_reference": "log4j-jcl-0:2.17.2-1.el9.tuxcare.els1.noarch",
        "relates_to_product_reference": "Rocky Linux-9.6"
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    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-34479",
      "cwe": {
        "id": "CWE-116",
        "name": "Improper Encoding or Escaping of Output"
      },
      "notes": [
        {
          "category": "description",
          "text": "The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records.\n\nTwo groups of users are affected:\n\n  *  Those using Log4j1XmlLayout directly in a Log4j Core 2 configuration file.\n  *  Those using the Log4j 1 configuration compatibility layer with org.apache.log4j.xml.XMLLayout specified as the layout class.\n\n\nUsers are advised to upgrade to Apache Log4j 1-to-Log4j 2 bridge version 2.25.4, which corrects this issue.\n\nNote: The Apache Log4j 1-to-Log4j 2 bridge is deprecated and will not be present in Log4j 3. Users are encouraged to consult the  Log4j 1 to Log4j 2 migration guide https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html , and specifically the section on eliminating reliance on the bridge.",
          "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-9.6:log4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
          "AlmaLinux-9.6:log4j-jcl-0:2.17.2-1.el9.tuxcare.els1.noarch",
          "AlmaLinux-9.6:log4j-slf4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
          "AlmaLinux-9.6:log4j-web-0:2.17.2-1.el9.tuxcare.els1.noarch",
          "Rocky Linux-9.6:log4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
          "Rocky Linux-9.6:log4j-jcl-0:2.17.2-1.el9.tuxcare.els1.noarch",
          "Rocky Linux-9.6:log4j-slf4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
          "Rocky Linux-9.6:log4j-web-0:2.17.2-1.el9.tuxcare.els1.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-34479"
        },
        {
          "category": "external",
          "summary": "https://github.com/apache/logging-log4j2/pull/4078",
          "url": "https://github.com/apache/logging-log4j2/pull/4078"
        },
        {
          "category": "external",
          "summary": "https://lists.apache.org/thread/gd0hp6mj17rn3kj279vgy4p7kd4zz5on",
          "url": "https://lists.apache.org/thread/gd0hp6mj17rn3kj279vgy4p7kd4zz5on"
        },
        {
          "category": "external",
          "summary": "https://logging.apache.org/cyclonedx/vdr.xml",
          "url": "https://logging.apache.org/cyclonedx/vdr.xml"
        },
        {
          "category": "external",
          "summary": "https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html",
          "url": "https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html"
        },
        {
          "category": "external",
          "summary": "https://logging.apache.org/security.html#CVE-2026-34479",
          "url": "https://logging.apache.org/security.html#CVE-2026-34479"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/04/10/8",
          "url": "http://www.openwall.com/lists/oss-security/2026/04/10/8"
        }
      ],
      "release_date": "2026-04-10T16:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-18T17:20:33.189271Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1779124827",
          "product_ids": [
            "AlmaLinux-9.6:log4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "AlmaLinux-9.6:log4j-jcl-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "AlmaLinux-9.6:log4j-slf4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "AlmaLinux-9.6:log4j-web-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "Rocky Linux-9.6:log4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "Rocky Linux-9.6:log4j-jcl-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "Rocky Linux-9.6:log4j-slf4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "Rocky Linux-9.6:log4j-web-0:2.17.2-1.el9.tuxcare.els1.noarch"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1779124827"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "AlmaLinux-9.6:log4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "AlmaLinux-9.6:log4j-jcl-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "AlmaLinux-9.6:log4j-slf4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "AlmaLinux-9.6:log4j-web-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "Rocky Linux-9.6:log4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "Rocky Linux-9.6:log4j-jcl-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "Rocky Linux-9.6:log4j-slf4j-0:2.17.2-1.el9.tuxcare.els1.noarch",
            "Rocky Linux-9.6:log4j-web-0:2.17.2-1.el9.tuxcare.els1.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}