{
  "document": {
    "aggregate_severity": {
      "text": "High"
    },
    "category": "csaf_vex",
    "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"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_alt_common/el6/vex/2026/cve-2026-11979-els_alt_common-el6.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-09-17T17:48:37Z",
      "generator": {
        "date": "2026-09-17T17:48:37Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2026-11979-ELS_ALT_COMMON-EL6",
      "initial_release_date": "2026-06-29T14:16:00Z",
      "revision_history": [
        {
          "date": "2026-06-29T14:16:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-09-17T17:48:37Z",
          "number": "2",
          "summary": "Official Publication"
        }
      ],
      "status": "final",
      "version": "2"
    },
    "title": "Security update on CVE-2026-11979"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Community Enterprise Operating System 6",
                "product": {
                  "name": "Community Enterprise Operating System 6",
                  "product_id": "CentOS-6",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:centos:centos:6:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Community Enterprise Operating System"
          }
        ],
        "category": "vendor",
        "name": "Cloud Linux Software, Inc."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "alt-libxml2-0:2.10.2-9.el6.x86_64",
                "product": {
                  "name": "alt-libxml2-0:2.10.2-9.el6.x86_64",
                  "product_id": "alt-libxml2-0:2.10.2-9.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-libxml2@2.10.2-9.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "alt-libxml2-devel-0:2.10.2-9.el6.x86_64",
                "product": {
                  "name": "alt-libxml2-devel-0:2.10.2-9.el6.x86_64",
                  "product_id": "alt-libxml2-devel-0:2.10.2-9.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-libxml2-devel@2.10.2-9.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "alt-libxml2-static-0:2.10.2-9.el6.x86_64",
                "product": {
                  "name": "alt-libxml2-static-0:2.10.2-9.el6.x86_64",
                  "product_id": "alt-libxml2-static-0:2.10.2-9.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-libxml2-static@2.10.2-9.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "alt-libxml2-0:2.10.2-7.el6.x86_64",
                "product": {
                  "name": "alt-libxml2-0:2.10.2-7.el6.x86_64",
                  "product_id": "alt-libxml2-0:2.10.2-7.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-libxml2@2.10.2-7.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "alt-libxml2-devel-0:2.10.2-7.el6.x86_64",
                "product": {
                  "name": "alt-libxml2-devel-0:2.10.2-7.el6.x86_64",
                  "product_id": "alt-libxml2-devel-0:2.10.2-7.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-libxml2-devel@2.10.2-7.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "alt-libxml2-static-0:2.10.2-7.el6.x86_64",
                "product": {
                  "name": "alt-libxml2-static-0:2.10.2-7.el6.x86_64",
                  "product_id": "alt-libxml2-static-0:2.10.2-7.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-libxml2-static@2.10.2-7.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "alt-libxml2-0:2.10.2-6.el6.x86_64",
                "product": {
                  "name": "alt-libxml2-0:2.10.2-6.el6.x86_64",
                  "product_id": "alt-libxml2-0:2.10.2-6.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-libxml2@2.10.2-6.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "alt-libxml2-devel-0:2.10.2-6.el6.x86_64",
                "product": {
                  "name": "alt-libxml2-devel-0:2.10.2-6.el6.x86_64",
                  "product_id": "alt-libxml2-devel-0:2.10.2-6.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-libxml2-devel@2.10.2-6.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "alt-libxml2-static-0:2.10.2-6.el6.x86_64",
                "product": {
                  "name": "alt-libxml2-static-0:2.10.2-6.el6.x86_64",
                  "product_id": "alt-libxml2-static-0:2.10.2-6.el6.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/alt-libxml2-static@2.10.2-6.el6?arch=x86_64&os_name=centos&os_version=6"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-libxml2-0:2.10.2-9.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-libxml2-0:2.10.2-9.el6.x86_64"
        },
        "product_reference": "alt-libxml2-0:2.10.2-9.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-libxml2-devel-0:2.10.2-9.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-libxml2-devel-0:2.10.2-9.el6.x86_64"
        },
        "product_reference": "alt-libxml2-devel-0:2.10.2-9.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-libxml2-static-0:2.10.2-9.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-libxml2-static-0:2.10.2-9.el6.x86_64"
        },
        "product_reference": "alt-libxml2-static-0:2.10.2-9.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-libxml2-0:2.10.2-7.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-libxml2-0:2.10.2-7.el6.x86_64"
        },
        "product_reference": "alt-libxml2-0:2.10.2-7.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-libxml2-devel-0:2.10.2-7.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-libxml2-devel-0:2.10.2-7.el6.x86_64"
        },
        "product_reference": "alt-libxml2-devel-0:2.10.2-7.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-libxml2-static-0:2.10.2-7.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-libxml2-static-0:2.10.2-7.el6.x86_64"
        },
        "product_reference": "alt-libxml2-static-0:2.10.2-7.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-libxml2-0:2.10.2-6.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-libxml2-0:2.10.2-6.el6.x86_64"
        },
        "product_reference": "alt-libxml2-0:2.10.2-6.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-libxml2-devel-0:2.10.2-6.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-libxml2-devel-0:2.10.2-6.el6.x86_64"
        },
        "product_reference": "alt-libxml2-devel-0:2.10.2-6.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "alt-libxml2-static-0:2.10.2-6.el6.x86_64 as a component of Community Enterprise Operating System 6",
          "product_id": "CentOS-6:alt-libxml2-static-0:2.10.2-6.el6.x86_64"
        },
        "product_reference": "alt-libxml2-static-0:2.10.2-6.el6.x86_64",
        "relates_to_product_reference": "CentOS-6"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-11979",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "description",
          "text": "libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in --shell mode. The usershell() function processes user input using fixed-size stack buffers without proper bounds checking.\nBy supplying an overly long input line, an attacker can overflow internal buffers (command, arg, and argv) during input parsing. This results in memory corruption within the stack frame.\nSuccessful exploitation may cause a crash or potentially allow arbitrary code execution in the context of the xmlcatalog process.\n\nThis issue has been fixed in the commit c2e233fc.\n\nNOTE:\nThe maintainers of this project did not agree that this issue is a vulnerability and considered it a bug.",
          "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": [
          "CentOS-6:alt-libxml2-0:2.10.2-9.el6.x86_64",
          "CentOS-6:alt-libxml2-devel-0:2.10.2-9.el6.x86_64",
          "CentOS-6:alt-libxml2-static-0:2.10.2-9.el6.x86_64"
        ],
        "known_affected": [
          "CentOS-6:alt-libxml2-0:2.10.2-6.el6.x86_64",
          "CentOS-6:alt-libxml2-0:2.10.2-7.el6.x86_64",
          "CentOS-6:alt-libxml2-devel-0:2.10.2-6.el6.x86_64",
          "CentOS-6:alt-libxml2-devel-0:2.10.2-7.el6.x86_64",
          "CentOS-6:alt-libxml2-static-0:2.10.2-6.el6.x86_64",
          "CentOS-6:alt-libxml2-static-0:2.10.2-7.el6.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els-alt-common/cve/CVE-2026-11979"
        },
        {
          "category": "external",
          "summary": "https://cert.pl/en/posts/2026/06/CVE-2026-11979",
          "url": "https://cert.pl/en/posts/2026/06/CVE-2026-11979"
        },
        {
          "category": "external",
          "summary": "https://gitlab.gnome.org/GNOME/libxml2/-/commit/c2e233fc1b341685fc99621b2768b503f777a72e",
          "url": "https://gitlab.gnome.org/GNOME/libxml2/-/commit/c2e233fc1b341685fc99621b2768b503f777a72e"
        }
      ],
      "release_date": "2026-06-29T14:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-17T17:47:18.823783Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els-alt-common/releases/CLSA-2026:1789667236",
          "product_ids": [
            "CentOS-6:alt-libxml2-0:2.10.2-9.el6.x86_64",
            "CentOS-6:alt-libxml2-devel-0:2.10.2-9.el6.x86_64",
            "CentOS-6:alt-libxml2-static-0:2.10.2-9.el6.x86_64"
          ],
          "url": "https://cve.tuxcare.com/els-alt-common/releases/CLSA-2026:1789667236"
        },
        {
          "category": "none_available",
          "date": "2026-06-29T14:16:00Z",
          "details": "Affected",
          "product_ids": [
            "CentOS-6:alt-libxml2-0:2.10.2-6.el6.x86_64",
            "CentOS-6:alt-libxml2-0:2.10.2-7.el6.x86_64",
            "CentOS-6:alt-libxml2-devel-0:2.10.2-6.el6.x86_64",
            "CentOS-6:alt-libxml2-devel-0:2.10.2-7.el6.x86_64",
            "CentOS-6:alt-libxml2-static-0:2.10.2-6.el6.x86_64",
            "CentOS-6:alt-libxml2-static-0:2.10.2-7.el6.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CentOS-6:alt-libxml2-0:2.10.2-6.el6.x86_64",
            "CentOS-6:alt-libxml2-0:2.10.2-7.el6.x86_64",
            "CentOS-6:alt-libxml2-devel-0:2.10.2-6.el6.x86_64",
            "CentOS-6:alt-libxml2-devel-0:2.10.2-7.el6.x86_64",
            "CentOS-6:alt-libxml2-static-0:2.10.2-6.el6.x86_64",
            "CentOS-6:alt-libxml2-static-0:2.10.2-7.el6.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}