unbound: Fix of 11 CVEs

{
  "id": "1e1ddb753213710ae0642dc43b4071d504ef44cb4f63b9285f53511435c96830",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1785888218",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "unbound: Fix of 11 CVEs",
    "summary": "- CVE-2026-46582: mark a wildcard-expanded rrset bogus in the cache when the wildcard proof fails, so a replayed wildcard rrset is not served as secure - CVE-2026-40691: bound the DNSCrypt reply length against the destination buffer capacity on the TCP path - CVE-2026-42955: clamp the TTL of parent-side A/AAAA glue records to prevent a one-time ghost domain delegation renewal - CVE-2026-44621: avoid abrupt termination of libunbound applications configured with unwanted-reply-threshold - CVE-2026-44687: correct an off-by-one in harden-below-nxdomain that let a parent NXDOMAIN shadow a stub or forward zone - CVE-2026-50046: fix a use-after-free on the error path when a DoT forwarded query is jostled out - CVE-2026-50248: reject a DNSSEC bogus configured primary hostname as an XFR endpoint for auth and rpz zones - CVE-2026-50251: do not let attacker supplied 0.0.0.0 or :: glue trigger a defensive full cache flush - CVE-2026-55708: create view-specific local zone defaults when adding local data to a view that has none - CVE-2026-55717: clear the partial reply after a successful response-ip CNAME merge to prevent a crash with serve-expired - CVE-2026-55990: fail fast when dnscrypt-provider-cert files have no matching dnscrypt-secret-key",
    "evidence": "osv:CLSA-2026-1785888218",
    "products": [
      {
        "name": {
          "value": "python3-unbound",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-19.el9_6.1.tuxcare.els12",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-19.el9_6.1.tuxcare.els12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-devel",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-19.el9_6.1.tuxcare.els12",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-dracut",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-19.el9_6.1.tuxcare.els12",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-libs",
          "evidence": "/affected/4/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-19.el9_6.1.tuxcare.els12",
            "evidence": "/affected/4/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1785888218",
      "aliases": [
        "CLSA-2026-1785888218"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-19.el9_6.1.tuxcare.els12"
                }
              ]
            }
          ],
          "package": {
            "name": "python3-unbound",
            "purl": "pkg:rpm/tuxcare/python3-unbound?distro=almalinux-9.6",
            "ecosystem": "TuxCare:AlmaLinux:9.6"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785888218.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-19.el9_6.1.tuxcare.els12"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound",
            "purl": "pkg:rpm/tuxcare/unbound?distro=almalinux-9.6",
            "ecosystem": "TuxCare:AlmaLinux:9.6"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785888218.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-19.el9_6.1.tuxcare.els12"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-devel",
            "purl": "pkg:rpm/tuxcare/unbound-devel?distro=almalinux-9.6",
            "ecosystem": "TuxCare:AlmaLinux:9.6"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785888218.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-19.el9_6.1.tuxcare.els12"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-dracut",
            "purl": "pkg:rpm/tuxcare/unbound-dracut?distro=almalinux-9.6",
            "ecosystem": "TuxCare:AlmaLinux:9.6"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785888218.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-19.el9_6.1.tuxcare.els12"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-libs",
            "purl": "pkg:rpm/tuxcare/unbound-libs?distro=almalinux-9.6",
            "ecosystem": "TuxCare:AlmaLinux:9.6"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785888218.json"
          }
        }
      ],
      "modified": "2026-10-26T09:43:41.880263564Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-40691",
        "CVE-2026-42955",
        "CVE-2026-44621",
        "CVE-2026-44687",
        "CVE-2026-46582",
        "CVE-2026-50046",
        "CVE-2026-50248",
        "CVE-2026-50251",
        "CVE-2026-55708",
        "CVE-2026-55717",
        "CVE-2026-55990"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1785888218.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40691",
        "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-2026-46582",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-50046",
        "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-2026-55990"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-40691",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-42955",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-44621",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-44687",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-46582",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-50046",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-50248",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-50251",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-55708",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-55717",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-55990",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 450086,
  "published_at": "2026-08-05T00:03:56+00:00"
}