unbound: Fix of 2 CVEs

{
  "id": "ac07e1a493ebc0c82bcdba77a04ff1031fe4c85589081dd5d2a2cb7c50105a3c",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1790803691",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "unbound: Fix of 2 CVEs",
    "summary": "- CVE-2026-81634: check the remaining buffer space in rrset_canonical() and rrset_canonicalize_to_buffer() before writing the signature, owner name and RDATA, so an oversized RRset can no longer overflow the heap buffer during DNSSEC canonicalization; includes the upstream unit test - CVE-2026-80225: cap the pipelined queries drained from one TCP/DoT connection per event-loop turn (NUM_TCP_PER_SELECT) and defer the rest with a zero-delay timer, so one client can no longer starve other connections",
    "evidence": "osv:CLSA-2026-1790803691",
    "products": [
      {
        "name": {
          "value": "python3-unbound",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.16.2-3.el9_2.tuxcare.els16",
            "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.els16",
            "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.els16",
            "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.els16",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1790803691",
      "aliases": [
        "CLSA-2026-1790803691"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els16"
                }
              ]
            }
          ],
          "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-2026-1790803691.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els16"
                }
              ]
            }
          ],
          "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-2026-1790803691.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els16"
                }
              ]
            }
          ],
          "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-2026-1790803691.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.16.2-3.el9_2.tuxcare.els16"
                }
              ]
            }
          ],
          "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-2026-1790803691.json"
          }
        }
      ],
      "modified": "2026-10-26T09:43:50.599051450Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-80225",
        "CVE-2026-81634"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1790803691.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80225",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-81634"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-80225",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-81634",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 450181,
  "published_at": "2026-09-30T21:28:25+00:00"
}