unbound: Fix of CVE-2026-50252

{
  "id": "279b6e91aa3d48f5ceb2cd79b4e73719c3ba9e018f7e4b4e7945e64ba32fa2d2",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1785412633",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "unbound: Fix of CVE-2026-50252",
    "summary": "- CVE-2026-50252: DNS cache poisoning via per-thread source port partitioning; with 'so-reuseport: yes' and multiple threads the outgoing source port revealed the worker thread, lowering effective port entropy",
    "evidence": "osv:CLSA-2026-1785412633",
    "products": [
      {
        "name": {
          "value": "unbound",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.6-5.el7_8.tuxcare.els7",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-devel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.6-5.el7_8.tuxcare.els7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-libs",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.6-5.el7_8.tuxcare.els7",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "unbound-python",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.6.6-5.el7_8.tuxcare.els7",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1785412633",
      "aliases": [
        "CLSA-2026-1785412633"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.6-5.el7_8.tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound",
            "purl": "pkg:rpm/tuxcare/unbound?distro=oraclelinux-7",
            "ecosystem": "TuxCare:OracleLinux:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1785412633.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.6-5.el7_8.tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-devel",
            "purl": "pkg:rpm/tuxcare/unbound-devel?distro=oraclelinux-7",
            "ecosystem": "TuxCare:OracleLinux:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1785412633.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.6-5.el7_8.tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-libs",
            "purl": "pkg:rpm/tuxcare/unbound-libs?distro=oraclelinux-7",
            "ecosystem": "TuxCare:OracleLinux:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1785412633.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.6.6-5.el7_8.tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "unbound-python",
            "purl": "pkg:rpm/tuxcare/unbound-python?distro=oraclelinux-7",
            "ecosystem": "TuxCare:OracleLinux:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1785412633.json"
          }
        }
      ],
      "modified": "2026-10-26T09:31:55.719067693Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-50252"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/oraclelinux7els/CLSA-2026-1785412633.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-50252"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-50252",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 449005,
  "published_at": "2026-07-30T11:57:23+00:00"
}