unbound: Fix of 4 CVEs

{
  "id": "ca5f456474c68c10157a92d3ecfc519d661fb21d0e91593c70194288749fd938",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1791261872",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "unbound: Fix of 4 CVEs",
    "summary": "- CVE-2026-81634: bounds-check the scratch buffer in rrset_canonical() and rrset_canonicalize_to_buffer() before writing the RRSIG rdata, the first canonical owner name and each RR's rdata, so a large rrset can no longer be written past the end of the buffer - CVE-2026-80225: cap the number of pipelined TCP/DoT queries drained per event-loop visit in tcp_req_info_read_again() and tcp_more_read_again() and defer the remainder via a zero-delay timer, so one connection can no longer starve the other file descriptors - CVE-2026-85501: bound the DNSSEC validation work per query (ReTrap): add the val-validation-attempts and val-hash-attempts limits (default 32), limit DNSKEY/RRSIG and DS key-tag matches and the NSEC/NSEC3 records checked per message, shorten oversized referral DS RRsets, stop validator restarts once the limits are hit, and require only the answer and authority sections to be secure; the built-in val-clean-additional default is now no, the shipped unbound.conf keeps val-clean-additional: yes",
    "evidence": "osv:CLSA-2026-1791261872",
    "products": [
      {
        "name": {
          "value": "python3-unbound",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-5.el8.tuxcare.els12",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-5.el8.tuxcare.els12",
            "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.els12",
            "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.els12",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1791261872",
      "aliases": [
        "CLSA-2026-1791261872"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-5.el8.tuxcare.els12"
                }
              ]
            }
          ],
          "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-2026-1791261872.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-5.el8.tuxcare.els12"
                }
              ]
            }
          ],
          "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-2026-1791261872.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-5.el8.tuxcare.els12"
                }
              ]
            }
          ],
          "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-2026-1791261872.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-5.el8.tuxcare.els12"
                }
              ]
            }
          ],
          "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-2026-1791261872.json"
          }
        }
      ],
      "modified": "2026-10-26T09:43:32.552617974Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-80225",
        "CVE-2026-81634",
        "CVE-2026-85501"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/centos-stream8els/CLSA-2026-1791261872.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-50387",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80225",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-81634",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-85501"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-80225",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-81634",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-85501",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 449981,
  "published_at": "2026-10-19T14:45:10+00:00"
}