unbound: Fix of 3 CVEs

{
  "id": "e35d81e8ba317e8db4cf2566119c15d5a868eba59096f1966362ad16ca3964f5",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1780055430",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "unbound: Fix of 3 CVEs",
    "summary": "- CVE-2026-42944: fix heap overflow when a query contains multiple NSID or PADDING EDNS options; only emit each option once per query via nsid_seen / padding_seen guards (COOKIE handler does not exist in 1.16.2) - CVE-2026-41292: cap parsed incoming EDNS options at 100 per query so a flood of options cannot hold a resolver worker thread - CVE-2026-42959: fix DNSSEC-validation crash in val_fill_reply() by using chase->ns_numrrsets instead of the wrong orig->ns_numrrsets when computing the chase rrsets offset",
    "evidence": "osv:CLSA-2026-1780055430",
    "products": [
      {
        "name": {
          "value": "python3-unbound",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-5.el8.tuxcare.els7",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-5.el8.tuxcare.els7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-devel",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-5.el8.tuxcare.els7",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-libs",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-5.el8.tuxcare.els7",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1780055430",
      "aliases": [
        "CLSA-2026-1780055430"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-5.el8.tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "python3-unbound",
            "purl": "pkg:rpm/tuxcare/python3-unbound?distro=centos-stream-8",
            "ecosystem": "TuxCare:CentOS-Stream:8"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1780055430.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-5.el8.tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound",
            "purl": "pkg:rpm/tuxcare/unbound?distro=centos-stream-8",
            "ecosystem": "TuxCare:CentOS-Stream:8"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1780055430.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-5.el8.tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-devel",
            "purl": "pkg:rpm/tuxcare/unbound-devel?distro=centos-stream-8",
            "ecosystem": "TuxCare:CentOS-Stream:8"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1780055430.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-5.el8.tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-libs",
            "purl": "pkg:rpm/tuxcare/unbound-libs?distro=centos-stream-8",
            "ecosystem": "TuxCare:CentOS-Stream:8"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1780055430.json"
          }
        }
      ],
      "modified": "2026-10-26T09:43:17.024126963Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-41292",
        "CVE-2026-42944",
        "CVE-2026-42959"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/centos-stream8els/CLSA-2026-1780055430.html"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-41292",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-42944",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-42959",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 449810,
  "published_at": "2026-05-29T11:50:34+00:00"
}