unbound: Fix of 14 CVEs

{
  "id": "fd33c4af9cfd3388514adfb16f0062e55101d0e654b596f2815991654229d04b",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1786637650",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "unbound: Fix of 14 CVEs",
    "summary": "- CVE-2024-33655: add the upstream wait-limit and discard-timeout mechanism so accumulated recursion replies can no longer be released as a pulsing burst (DNSBomb), including every upstream follow-up to that mechanism: discard only UDP replies and never a reply on an open stream connection, clear the HTTP/2 stream back-pointer on the drop paths, account discarded replies in mesh num_reply_addrs, and fix CVE-2026-56444 in the serve-expired discard path - CVE-2024-43167: NULL-check the first forward stub name in ub_ctx_set_fwd() to prevent a NULL pointer dereference in libunbound, and reject a forward-zone, stub-zone or view without a name at config parse time so no name-less object reaches the daemon - CVE-2026-42955: clamp the cached TTL of parent-side A/AAAA glue as well as NS records so a client query can no longer renew a ghost domain delegation - CVE-2026-46582: keep a secure wildcard RRset out of the rrset cache until the NSEC wildcard proof completes, preventing poisoning via the serve-expired reply path - CVE-2026-50243: skip the response-ip/RPZ rewrite for BOGUS answers so a spoofed DNSSEC-protected answer is no longer redirected as INSECURE - CVE-2026-55708: enter the default-protected local zones when unbound-control view_local_data creates a view-specific local zone tree",
    "evidence": "osv:CLSA-2026-1786637650",
    "products": [
      {
        "name": {
          "value": "python3-unbound",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-3.el9_2.tuxcare.els14",
            "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.els14",
            "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.els14",
            "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.els14",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1786637650",
      "aliases": [
        "CLSA-2026-1786637650"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els14"
                }
              ]
            }
          ],
          "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-2026-1786637650.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els14"
                }
              ]
            }
          ],
          "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-2026-1786637650.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els14"
                }
              ]
            }
          ],
          "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-2026-1786637650.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els14"
                }
              ]
            }
          ],
          "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-2026-1786637650.json"
          }
        }
      ],
      "modified": "2026-10-26T09:43:28.199914775Z",
      "provider": "osv",
      "upstream": [
        "CVE-2024-33655",
        "CVE-2024-43167",
        "CVE-2026-42955",
        "CVE-2026-46582",
        "CVE-2026-50243",
        "CVE-2026-55708",
        "CVE-2026-56444"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1786637650.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-33655",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-43167",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42955",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44621",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44687",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44690",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-46582",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-50046",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-50243",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-50248",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-50251",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-55708",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-55717",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-56416"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2024-33655",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2024-43167",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-42955",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-46582",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-50243",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-55708",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-56444",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 449927,
  "published_at": "2026-08-21T13:02:14+00:00"
}