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Fix CVE(s): CVE-2026-5946

Type: advisorySources: OSV

* SECURITY UPDATE: assertion failures in named when handling DNS messages whose CLASS is not IN or that use the meta-classes ANY or NONE - debian/patches/CVE-2026-5946-1.patch: force recursion off and set the allow-recursion ACLs to none for views with a class other than IN - debian/patches/CVE-2026-5946-2.patch: return NOTIMP for UPDATE and NOTIFY in non-IN views, check the class before treating WKS rdata as class IN, and assert that updated zones are class IN - debian/patches/CVE-2026-5946-3.patch: validate the message CLASS early, returning NOTIMP for unsupported classes and FORMERR for NONE outside UPDATE and ANY outside TKEY negotiation - debian/patches/CVE-2026-5946-4.patch: reject UPDATE and NOTIFY messages whose question class is ANY or NONE with FORMERR - debian/patches/CVE-2026-5946-5.patch: skip deny-answer-address matching for non-IN address records - CVE-2026-5946

Products
bind9, bind9-doc, bind9-host, bind9utils, dnsutils, host, libbind-dev, libbind-export-dev, libbind9-140, libdns-export162, libdns162, libirs-export141, libirs141, libisc-export160, libisc160, libisccc-export140, libisccc140, libisccfg-export140, libisccfg140, liblwres141, lwresd
Affected versions
Not specified
Fixed versions
2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13
CVEs
CVE-2026-5946
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 11:40 UTC · Revision 1

Source evidence

Fix CVE(s): CVE-2026-5946

core-osv · Original source

Published 23 Sept 2026, 10:17 UTC

* SECURITY UPDATE: assertion failures in named when handling DNS messages whose CLASS is not IN or that use the meta-classes ANY or NONE - debian/patches/CVE-2026-5946-1.patch: force recursion off and set the allow-recursion ACLs to none for views with a class other than IN - debian/patches/CVE-2026-5946-2.patch: return NOTIMP for UPDATE and NOTIFY in non-IN views, check the class before treating WKS rdata as class IN, and assert that updated zones are class IN - debian/patches/CVE-2026-5946-3.patch: validate the message CLASS early, returning NOTIMP for unsupported classes and FORMERR for NONE outside UPDATE and ANY outside TKEY negotiation - debian/patches/CVE-2026-5946-4.patch: reject UPDATE and NOTIFY messages whose question class is ANY or NONE with FORMERR - debian/patches/CVE-2026-5946-5.patch: skip deny-answer-address matching for non-IN address records - CVE-2026-5946

osv:CLSA-2026-1790158621

bind9

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

bind9-doc

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

bind9-host

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

bind9utils

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

dnsutils

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

host

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libbind-dev

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libbind-export-dev

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libbind9-140

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libdns-export162

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libdns162

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libirs-export141

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libirs141

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libisc-export160

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libisc160

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libisccc-export140

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libisccc140

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libisccfg-export140

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

libisccfg140

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

liblwres141

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

lwresd

Fixed versions: 2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13

Complete source record
{
  "id": "a6adae07f18c413fd6da3dfe717d558e0fd1732d150d8727c9fd06cc5db61c82",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1790158621",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Fix CVE(s): CVE-2026-5946",
    "summary": "* SECURITY UPDATE: assertion failures in named when handling DNS messages whose CLASS is not IN or that use the meta-classes ANY or NONE - debian/patches/CVE-2026-5946-1.patch: force recursion off and set the allow-recursion ACLs to none for views with a class other than IN - debian/patches/CVE-2026-5946-2.patch: return NOTIMP for UPDATE and NOTIFY in non-IN views, check the class before treating WKS rdata as class IN, and assert that updated zones are class IN - debian/patches/CVE-2026-5946-3.patch: validate the message CLASS early, returning NOTIMP for unsupported classes and FORMERR for NONE outside UPDATE and ANY outside TKEY negotiation - debian/patches/CVE-2026-5946-4.patch: reject UPDATE and NOTIFY messages whose question class is ANY or NONE with FORMERR - debian/patches/CVE-2026-5946-5.patch: skip deny-answer-address matching for non-IN address records - CVE-2026-5946",
    "evidence": "osv:CLSA-2026-1790158621",
    "products": [
      {
        "name": {
          "value": "bind9",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "bind9-doc",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "bind9-host",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "bind9utils",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "dnsutils",
          "evidence": "/affected/4/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/4/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "host",
          "evidence": "/affected/5/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/5/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libbind-dev",
          "evidence": "/affected/6/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/6/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libbind-export-dev",
          "evidence": "/affected/7/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/7/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libbind9-140",
          "evidence": "/affected/8/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/8/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libdns-export162",
          "evidence": "/affected/9/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/9/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libdns162",
          "evidence": "/affected/10/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/10/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libirs-export141",
          "evidence": "/affected/11/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/11/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libirs141",
          "evidence": "/affected/12/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/12/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libisc-export160",
          "evidence": "/affected/13/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/13/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libisc160",
          "evidence": "/affected/14/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/14/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libisccc-export140",
          "evidence": "/affected/15/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/15/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libisccc140",
          "evidence": "/affected/16/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/16/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libisccfg-export140",
          "evidence": "/affected/17/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/17/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libisccfg140",
          "evidence": "/affected/18/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/18/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "liblwres141",
          "evidence": "/affected/19/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/19/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "lwresd",
          "evidence": "/affected/20/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13",
            "evidence": "/affected/20/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1790158621",
      "aliases": [
        "CLSA-2026-1790158621"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "bind9",
            "purl": "pkg:deb/tuxcare/bind9?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "bind9-doc",
            "purl": "pkg:deb/tuxcare/bind9-doc?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "bind9-host",
            "purl": "pkg:deb/tuxcare/bind9-host?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "bind9utils",
            "purl": "pkg:deb/tuxcare/bind9utils?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "dnsutils",
            "purl": "pkg:deb/tuxcare/dnsutils?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "host",
            "purl": "pkg:deb/tuxcare/host?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "libbind-dev",
            "purl": "pkg:deb/tuxcare/libbind-dev?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "libbind-export-dev",
            "purl": "pkg:deb/tuxcare/libbind-export-dev?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "libbind9-140",
            "purl": "pkg:deb/tuxcare/libbind9-140?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "libdns-export162",
            "purl": "pkg:deb/tuxcare/libdns-export162?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "libdns162",
            "purl": "pkg:deb/tuxcare/libdns162?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "libirs-export141",
            "purl": "pkg:deb/tuxcare/libirs-export141?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:9.10.3.dfsg.P4-8ubuntu1.19+tuxcare.els13"
                }
              ]
            }
          ],
          "package": {
            "name": "libirs141",
            "purl": "pkg:deb/tuxcare/libirs141?distro=ubuntu-16.04",
            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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              ]
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          ],
          "package": {
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            "ecosystem": "TuxCare:Ubuntu:16.04"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1790158621.json"
          }
        },
        {
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                {
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                }
              ]
            }
          ],
          "package": {
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          }
        }
      ],
      "modified": "2026-10-26T09:32:02.425169694Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-5946"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/ubuntu16.04els/CLSA-2026-1790158621.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-5946"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-5946",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 449450,
  "published_at": "2026-09-23T10:17:11+00:00"
}