{
  "document": {
    "aggregate_severity": {
      "text": "Moderate"
    },
    "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-2024-8508: limit number of name compression calculations per packet to\n  prevent denial of service attacks.",
        "title": "Details"
      }
    ],
    "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_os/centos7els/advisories/2025/clsa-2025_1765997462.json"
      },
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2025:1765997462",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2025:1765997462"
      }
    ],
    "tracking": {
      "current_release_date": "2025-12-30T18:42:30Z",
      "generator": {
        "date": "2025-12-30T18:42:30Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2025:1765997462",
      "initial_release_date": "2025-12-17T18:51:04Z",
      "revision_history": [
        {
          "date": "2025-12-17T18:51:04Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2025-12-30T18:42:30Z",
          "number": "2",
          "summary": "Official Publication"
        }
      ],
      "status": "final",
      "version": "2"
    },
    "title": "unbound: Fix of CVE-2024-8508"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Community Enterprise Operating System 7",
                "product": {
                  "name": "Community Enterprise Operating System 7",
                  "product_id": "CentOS-7",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:centos:centos:7:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Community Enterprise Operating System"
          }
        ],
        "category": "vendor",
        "name": "Red Hat, Inc."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "unbound-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                "product": {
                  "name": "unbound-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                  "product_id": "unbound-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/unbound@1.6.6-5.el7_8.tuxcare.els4?arch=x86_64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                "product": {
                  "name": "unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                  "product_id": "unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/unbound-devel@1.6.6-5.el7_8.tuxcare.els4?arch=x86_64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "unbound-python-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                "product": {
                  "name": "unbound-python-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                  "product_id": "unbound-python-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/unbound-python@1.6.6-5.el7_8.tuxcare.els4?arch=x86_64"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                "product": {
                  "name": "unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                  "product_id": "unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/unbound-libs@1.6.6-5.el7_8.tuxcare.els4?arch=x86_64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.i686",
                "product": {
                  "name": "unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.i686",
                  "product_id": "unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.i686",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/unbound-devel@1.6.6-5.el7_8.tuxcare.els4?arch=i686"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.i686",
                "product": {
                  "name": "unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.i686",
                  "product_id": "unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.i686",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/tuxcare/unbound-libs@1.6.6-5.el7_8.tuxcare.els4?arch=i686"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "i686"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "unbound-0:1.6.6-5.el7_8.tuxcare.els4.x86_64 as a component of Community Enterprise Operating System 7",
          "product_id": "CentOS-7:unbound-0:1.6.6-5.el7_8.tuxcare.els4.x86_64"
        },
        "product_reference": "unbound-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
        "relates_to_product_reference": "CentOS-7"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.i686 as a component of Community Enterprise Operating System 7",
          "product_id": "CentOS-7:unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.i686"
        },
        "product_reference": "unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.i686",
        "relates_to_product_reference": "CentOS-7"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.x86_64 as a component of Community Enterprise Operating System 7",
          "product_id": "CentOS-7:unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.x86_64"
        },
        "product_reference": "unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
        "relates_to_product_reference": "CentOS-7"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "unbound-python-0:1.6.6-5.el7_8.tuxcare.els4.x86_64 as a component of Community Enterprise Operating System 7",
          "product_id": "CentOS-7:unbound-python-0:1.6.6-5.el7_8.tuxcare.els4.x86_64"
        },
        "product_reference": "unbound-python-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
        "relates_to_product_reference": "CentOS-7"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.i686 as a component of Community Enterprise Operating System 7",
          "product_id": "CentOS-7:unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.i686"
        },
        "product_reference": "unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.i686",
        "relates_to_product_reference": "CentOS-7"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.x86_64 as a component of Community Enterprise Operating System 7",
          "product_id": "CentOS-7:unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.x86_64"
        },
        "product_reference": "unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
        "relates_to_product_reference": "CentOS-7"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2024-8508",
      "cwe": {
        "id": "CWE-606",
        "name": "Unchecked Input for Loop Condition"
      },
      "notes": [
        {
          "category": "description",
          "text": "NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic.",
          "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-7:unbound-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
          "CentOS-7:unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.i686",
          "CentOS-7:unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
          "CentOS-7:unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.i686",
          "CentOS-7:unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
          "CentOS-7:unbound-python-0:1.6.6-5.el7_8.tuxcare.els4.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2024-8508"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txt"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2024/10/04/5",
          "url": "http://www.openwall.com/lists/oss-security/2024/10/04/5"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2024/11/msg00009.html",
          "url": "https://lists.debian.org/debian-lts-announce/2024/11/msg00009.html"
        }
      ],
      "release_date": "2024-10-03T17:15:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-12-17T18:51:04.842160Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2025:1765997462",
          "product_ids": [
            "CentOS-7:unbound-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
            "CentOS-7:unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.i686",
            "CentOS-7:unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
            "CentOS-7:unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.i686",
            "CentOS-7:unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
            "CentOS-7:unbound-python-0:1.6.6-5.el7_8.tuxcare.els4.x86_64"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2025:1765997462"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "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:L",
            "version": "3.1"
          },
          "products": [
            "CentOS-7:unbound-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
            "CentOS-7:unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.i686",
            "CentOS-7:unbound-devel-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
            "CentOS-7:unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.i686",
            "CentOS-7:unbound-libs-0:1.6.6-5.el7_8.tuxcare.els4.x86_64",
            "CentOS-7:unbound-python-0:1.6.6-5.el7_8.tuxcare.els4.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}