unbound: Fix of 3 CVEs

{
  "id": "e0660d8ee1808e4b2a60faac195d8629542b1e27e5a1928696419f92d6847b1b",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1779533909",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "unbound: Fix of 3 CVEs",
    "summary": "- CVE-2026-33278: dangling pointer dereference in dns_msg_deepcopy_region() during DS sub-query suspend/resume; the previously-backported CVE-2023-50387-CVE-2023-50868.patch dragged the vulnerable '*res->rep = *origin->rep;' struct-assignment into our 1.16.2 tree. Save the destination rrsets pointer, sized-memcpy with rrset_ref excluded, restore the pointer. Adds defense-in-depth param_set_same() NSEC3 parameter consistency check called from all five nsec3_prove_* entry points.",
    "evidence": "osv:CLSA-2026-1779533909",
    "products": [
      {
        "name": {
          "value": "python3-unbound",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-3.el9_2.tuxcare.els5",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-3.el9_2.tuxcare.els5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-devel",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-3.el9_2.tuxcare.els5",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-libs",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-3.el9_2.tuxcare.els5",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1779533909",
      "aliases": [
        "CLSA-2026-1779533909"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els5"
                }
              ]
            }
          ],
          "package": {
            "name": "python3-unbound",
            "purl": "pkg:rpm/tuxcare/python3-unbound?distro=almalinux-9.2",
            "ecosystem": "TuxCare:AlmaLinux:9.2"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1779533909.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els5"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound",
            "purl": "pkg:rpm/tuxcare/unbound?distro=almalinux-9.2",
            "ecosystem": "TuxCare:AlmaLinux:9.2"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1779533909.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els5"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-devel",
            "purl": "pkg:rpm/tuxcare/unbound-devel?distro=almalinux-9.2",
            "ecosystem": "TuxCare:AlmaLinux:9.2"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1779533909.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els5"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-libs",
            "purl": "pkg:rpm/tuxcare/unbound-libs?distro=almalinux-9.2",
            "ecosystem": "TuxCare:AlmaLinux:9.2"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1779533909.json"
          }
        }
      ],
      "modified": "2026-10-21T10:46:49.512455973Z",
      "provider": "osv",
      "upstream": [
        "CVE-2023-50387",
        "CVE-2023-50868",
        "CVE-2026-33278"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1779533909.html"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2023-50387",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2023-50868",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-33278",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 392275,
  "published_at": "2026-05-23T10:58:33+00:00"
}