unbound: Fix of 4 CVEs

{
  "id": "35a97e845174a444018a1447b6c5fa33c9e57b072eb04998c2d843f92a3b5c98",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1791327169",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "unbound: Fix of 4 CVEs",
    "summary": "- CVE-2026-81642: fix heap buffer overflow when digesting DNSKEY - CVE-2026-81634: add the missing first owner name and signature length bounds checks to rrset_canonical(), preventing a heap buffer overflow during RRset canonicalisation - CVE-2026-82717: restore the packet buffer position on malformed names in pkt_dname_len() and bound the copy lengths in rdata_copy(), preventing heap corruption on the CNAME synthesis error path - CVE-2026-85501: bound DNSSEC validation work per query: key-tag matches capped at 256, NSEC/NSEC3 verifications at 8 per message, new val-validation-attempts and val-hash-attempts options (default 32), oversized referral DS RRsets shortened to 20, and val-clean-additional now defaults to no",
    "evidence": "osv:CLSA-2026-1791327169",
    "products": [
      {
        "name": {
          "value": "unbound",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.6-5.0.1.el7_8.tuxcare.els2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-devel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.6-5.0.1.el7_8.tuxcare.els2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-libs",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.6-5.0.1.el7_8.tuxcare.els2",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-python",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.6-5.0.1.el7_8.tuxcare.els2",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1791327169",
      "aliases": [
        "CLSA-2026-1791327169"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.6-5.0.1.el7_8.tuxcare.els2"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound",
            "purl": "pkg:rpm/tuxcare/unbound?distro=centos-7",
            "ecosystem": "TuxCare:CentOS:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1791327169.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.6-5.0.1.el7_8.tuxcare.els2"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-devel",
            "purl": "pkg:rpm/tuxcare/unbound-devel?distro=centos-7",
            "ecosystem": "TuxCare:CentOS:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1791327169.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.6-5.0.1.el7_8.tuxcare.els2"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-libs",
            "purl": "pkg:rpm/tuxcare/unbound-libs?distro=centos-7",
            "ecosystem": "TuxCare:CentOS:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1791327169.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.6-5.0.1.el7_8.tuxcare.els2"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-python",
            "purl": "pkg:rpm/tuxcare/unbound-python?distro=centos-7",
            "ecosystem": "TuxCare:CentOS:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1791327169.json"
          }
        }
      ],
      "modified": "2026-10-26T09:43:27.512691006Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-81634",
        "CVE-2026-81642",
        "CVE-2026-82717",
        "CVE-2026-85501"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/centos7els/CLSA-2026-1791327169.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-81634",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-81642",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-82717",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-85501"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-81634",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-81642",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-82717",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-85501",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 449920,
  "published_at": "2026-10-08T21:56:57+00:00"
}