{"id":"CVE-2026-3591","aliases":["ALPINE-CVE-2026-3591","AZL-80987","BELL-CVE-2026-3591","DEBIAN-CVE-2026-3591","EUVD-2026-15413","GHSA-5fv2-2p94-9gh7","RHSA-2026:6935","SUSE-SU-2026:1351-1","SUSE-SU-2026:21204-1","UBUNTU-CVE-2026-3591","openSUSE-SU-2026:10448-1","openSUSE-SU-2026:20550-1"],"status":"published","title":"A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass","description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","severity":{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00367,"percentile":0.30758,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-305","CWE-562"],"published":"2026-03-25T00:00:00Z","modified":"2026-10-24T10:30:39Z","fixes":[{"ecosystem":"Alpine:v3.22","package":"bind","fixed_in":["9.20.21-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"bind","fixed_in":["9.20.21-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"bind","fixed_in":["9.20.21-r0"],"sources":["osv"]},{"ecosystem":"Azure Linux:3","package":"bind","fixed_in":["9.20.21-1"],"sources":["osv"]},{"ecosystem":"Alpaquita:25","package":"bind","fixed_in":["9.20.21-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:stream","package":"bind","fixed_in":["9.20.21-r0"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"bind9","fixed_in":["1:9.20.21-1~deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"bind9","fixed_in":["1:9.20.21-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:25.10","package":"bind9","fixed_in":["1:9.20.11-1ubuntu2.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.22","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.20.0"},{"fixed":"9.20.21-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.20.0"},{"fixed":"9.20.21-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.20.0"},{"fixed":"9.20.21-r0"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.20.21-1"}]}]},{"source":"osv","ecosystem":"Alpaquita:25","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.20.9-r0"},{"fixed":"9.20.21-r0"}]}]},{"source":"osv","ecosystem":"Alpaquita:stream","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.18.16-r0"},{"fixed":"9.20.21-r0"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"bind9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.21-1~deb13u1"}]}],"versions":["1:9.20.11-4","1:9.20.15-1","1:9.20.15-1~deb13u1","1:9.20.15-1~deb13u1~bpo12+1","1:9.20.15-2","1:9.20.18-1","1:9.20.18-1~deb13u1","1:9.20.18-1~deb13u1~bpo12+1","1:9.20.19-1","1:9.20.19-1~bpo12+1","1:9.20.20-1","1:9.20.20-1~bpo12+1","1:9.20.21-1~deb13u1~bpo12+1"]},{"source":"osv","ecosystem":"Debian:14","package":"bind9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.21-1"}]}],"versions":["1:9.20.11-4","1:9.20.15-1","1:9.20.15-1~deb13u1","1:9.20.15-1~deb13u1~bpo12+1","1:9.20.15-2","1:9.20.18-1","1:9.20.18-1~deb13u1","1:9.20.18-1~deb13u1~bpo12+1","1:9.20.19-1","1:9.20.19-1~bpo12+1","1:9.20.20-1","1:9.20.20-1~bpo12+1","1:9.20.21-1~deb13u1","1:9.20.21-1~deb13u1~bpo12+1"]},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.18.48-1.hum1"}]}],"bundled":8},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"bind-chroot","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.18.48-1.hum1"}]}],"bundled":8},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"bind-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.18.48-1.hum1"}]}],"bundled":8},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"bind-dnssec-utils","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.18.48-1.hum1"}]}],"bundled":8},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"bind-doc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.18.48-1.hum1"}]}],"bundled":8},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"bind-libs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.18.48-1.hum1"}]}],"bundled":8},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"bind-utils","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:9.18.48-1.hum1"}]}],"bundled":8},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP7","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.20.21-150700.3.18.1"}]}],"bundled":4},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Server Applications 15 SP7","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.20.21-150700.3.18.1"}]}],"bundled":4},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 16.0","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.20.21-160000.1.1"}]}],"bundled":4},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP applications 16.0","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.20.21-160000.1.1"}]}],"bundled":4},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"isc-dhcp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.5-3ubuntu2","4.3.5-3ubuntu3","4.3.5-3ubuntu4","4.3.5-3ubuntu5","4.3.5-3ubuntu6","4.3.5-3ubuntu7","4.3.5-3ubuntu7.1","4.3.5-3ubuntu7.2","4.3.5-3ubuntu7.3","4.3.5-3ubuntu7.4"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"bind9-libs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:9.11.16+dfsg-3~build1","1:9.11.16+dfsg-3~ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"bind9-libs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:9.11.19+dfsg-2.1ubuntu1","1:9.11.19+dfsg-2.1ubuntu2","1:9.11.19+dfsg-2.1ubuntu3"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"isc-dhcp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.3-P1-2ubuntu5","4.4.3-P1-4ubuntu1","4.4.3-P1-4ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"bind9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.11-1ubuntu2.2"}]}],"versions":["1:9.20.4-3ubuntu1","1:9.20.4-3ubuntu2","1:9.20.4-3ubuntu3","1:9.20.9-2ubuntu1","1:9.20.10-1ubuntu1","1:9.20.11-1ubuntu1","1:9.20.11-1ubuntu2","1:9.20.11-1ubuntu2.1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"isc-dhcp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.3-P1-4ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"isc-dhcp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.3-P1-4ubuntu2"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.20.21-1.1"}]}],"bundled":4},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.20.21-160000.1.1"}]}],"bundled":4}],"products":[{"vendor":"isc","product":"bind"},{"vendor":"isc","product":"bind 9"}],"references":[{"url":"https://kb.isc.org/docs/cve-2026-3591","tags":["vendor-advisory","Vendor Advisory","advisory","article","report"]},{"url":"https://downloads.isc.org/isc/bind9/9.20.21","tags":["patch","Patch","fix","article"]},{"url":"https://downloads.isc.org/isc/bind9/9.21.20","tags":["patch","Patch","fix","article"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3591","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-5fv2-2p94-9gh7"},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-3591","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-3591","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-3591","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:6935","tags":["advisory"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-8677","tags":["report"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-40780","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-40778","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-13878","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-3591","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-3119","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-3104","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-1519","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_6935.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2405830","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-8677","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-8677","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2431600","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-13878","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-13878","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2405827","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-40778","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40778","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2405829","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-40780","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40780","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451305","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-1519","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1519","tags":["advisory"]},{"url":"https://downloads.isc.org/isc/bind9/9.18.47","tags":["article"]},{"url":"https://kb.isc.org/docs/cve-2026-1519","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451310","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3104","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3104","tags":["advisory"]},{"url":"https://kb.isc.org/docs/cve-2026-3104","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451308","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3119","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3119","tags":["advisory"]},{"url":"https://kb.isc.org/docs/cve-2026-3119","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451298","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3591","tags":["advisory","report"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20261351-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1259202","tags":["report"]},{"url":"https://bugzilla.suse.com/1260567","tags":["report"]},{"url":"https://bugzilla.suse.com/1260568","tags":["report"]},{"url":"https://bugzilla.suse.com/1260569","tags":["report"]},{"url":"https://bugzilla.suse.com/1260805","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-1519","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-3104","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-3119","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-3591","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202621204-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-3591","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8124-1","tags":["advisory"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-3591","title":"A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass","description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","status":"published","published":"2026-03-25T13:34:14.202Z","modified":"2026-03-25T14:13:01.659Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-562","CWE-305"],"updated_at":"2026-11-02T13:49:09.229322Z"}],"euvd":[{"id":"EUVD-2026-15413","description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","status":"published","published":"2026-03-25T13:34:14Z","modified":"2026-03-25T14:13:01Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:25:29.129467Z"}],"ghsa":[{"id":"GHSA-5fv2-2p94-9gh7","title":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed...","description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","status":"published","published":"2026-03-25T15:31:29Z","modified":"2026-03-25T15:31:36Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-305"],"updated_at":"2026-11-02T15:06:50.631069Z"}],"nvd":[{"id":"CVE-2026-3591","description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","status":"published","published":"2026-03-25T14:16:37.297Z","modified":"2026-06-17T10:43:50.09Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-305","CWE-562"],"updated_at":"2026-11-02T14:12:11.077116Z"}],"osv":[{"id":"ALPINE-CVE-2026-3591","description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","status":"published","published":"2026-03-25T14:16:37.297Z","modified":"2026-10-01T02:17:49.267418566Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:27:50.764331Z"},{"id":"BELL-CVE-2026-3591","status":"published","published":"2026-03-26T06:08:19.746696Z","modified":"2026-03-28T07:18:02.084528Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:28:23.572955Z"},{"id":"CVE-2026-3591","description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","status":"published","published":"2026-03-25T14:16:37.297Z","modified":"2026-10-24T10:30:39.687549624Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:02.673625Z"},{"id":"DEBIAN-CVE-2026-3591","description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","status":"published","published":"2026-03-25T14:16:37.297Z","modified":"2026-10-01T03:02:38.485037541Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:54.587575Z"},{"id":"RHSA-2026:6935","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-04-20T10:10:53Z","modified":"2026-10-14T10:28:20Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:22.406388Z"},{"id":"UBUNTU-CVE-2026-3591","description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","status":"published","published":"2026-03-25T00:00:00Z","modified":"2026-05-20T16:25:37.489541445Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:16.686388Z"},{"id":"AZL-80987","title":"CVE-2026-3591 affecting package bind for versions less than 9.20.21-1","description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","status":"published","published":"2026-03-25T14:16:37Z","modified":"2026-08-28T17:56:21.543222Z","updated_at":"2026-11-02T15:28:10.017343Z"},{"id":"openSUSE-SU-2026:10448-1","title":"bind-9.20.21-1.1 on GA media","description":"These are all security issues fixed in the bind-9.20.21-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-03-28T00:00:00Z","modified":"2026-03-29T10:46:01.869176Z","updated_at":"2026-11-02T16:58:38.415593Z"},{"id":"openSUSE-SU-2026:20550-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- Update to release 9.20.21\n- CVE-2026-1519: maliciously crafted DNSSEC-validated zone can lead to denial of service (bsc#1260805).\n- CVE-2026-3104: memory leak in code preparing DNSSEC proofs of non-existence allows for DoS (bsc#1260567).\n- CVE-2026-3119: authenticated queries containing a TKEY record may cause `named` to terminate unexpectedly (bsc#1260568).\n- CVE-2026-3591: stack use-after-return flaw in SIG(0) handling code allows for ACL bypass (bsc#1260569).\n","status":"published","published":"2026-04-16T10:12:49Z","modified":"2026-04-22T18:23:49.844603Z","updated_at":"2026-11-02T16:58:41.463445Z"},{"id":"SUSE-SU-2026:1351-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\nSecurity issues:\n\n- CVE-2026-1519: maliciously crafted DNSSEC-validated zone can lead to denial of service (bsc#1260805).\n- CVE-2026-3104: memory leak in code preparing DNSSEC proofs of non-existence allows for DoS (bsc#1260567).\n- CVE-2026-3119: authenticated queries containing a TKEY record may cause `named` to terminate unexpectedly\n  (bsc#1260568).\n- CVE-2026-3591: stack use-after-return flaw in SIG(0) handling code allows for ACL bypass (bsc#1260569).\n- use-after-free error in `dns_client_resolve()` triggered by a DNAME response (bsc#1259202).\n\nUpgrade to release 9.20.21\n Security Fixes:\n * Fix unbounded NSEC3 iterations when validating referrals to\n unsigned delegations.\n (CVE-2026-1519)\n [bsc#1260805]\n * Fix memory leaks in code preparing DNSSEC proofs of\n non-existence.\n (CVE-2026-3104)\n [bsc#1260567]\n * Prevent a crash in code processing queries containing a TKEY\n record.\n (CVE-2026-3119)\n [bsc#1260568]\n * Fix a stack use-after-return flaw in SIG(0) handling code.\n (CVE-2026-3591)\n [bsc#1260569]\n * Fix a use-after-free error in dns_client_resolve() triggered by\n a DNAME response. This issue only affected the delv tool and it\n has now been fixed.\n [bsc#1259202]\n Feature Changes:\n * Record query time for all dnstap responses.\n * Optimize TCP source port selection on Linux.\n Bug Fixes:\n * Fix the handling of key statements defined inside views.\n * Fix an assertion failure triggered by non-minimal IXFRs.\n * Fix a crash when retrying a NOTIFY over TCP.\n * Fetch loop detection improvements.\n * Randomize nameserver selection.\n * Fix dnstap logging of forwarded queries.\n * A stale answer could have been served in case of multiple\n upstream failures when following CNAME chains. This has been\n fixed.\n * Fail DNSKEY validation when supported but invalid DS is found.\n * Importing an invalid SKR file might corrupt stack memory.\n * Return FORMERR for queries with the EDNS Client Subnet FAMILY\n field set to 0.\n * Fix inbound IXFR performance regression.\n * Make catalog zone names and member zones' entry names\n case-insensitive.\n * Fix implementation of BRID and HHIT record types.\n * Fix implementation of DSYNC record type.\n * Fix response policy and catalog zones to work with $INCLUDE\n directive.\n","status":"published","published":"2026-04-15T13:36:44Z","modified":"2026-04-16T08:31:25.41487Z","updated_at":"2026-11-02T15:54:01.262144Z"},{"id":"SUSE-SU-2026:21204-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\n- Update to release 9.20.21\n- CVE-2026-1519: maliciously crafted DNSSEC-validated zone can lead to denial of service (bsc#1260805).\n- CVE-2026-3104: memory leak in code preparing DNSSEC proofs of non-existence allows for DoS (bsc#1260567).\n- CVE-2026-3119: authenticated queries containing a TKEY record may cause `named` to terminate unexpectedly (bsc#1260568).\n- CVE-2026-3591: stack use-after-return flaw in SIG(0) handling code allows for ACL bypass (bsc#1260569).\n","status":"published","published":"2026-04-16T10:19:52Z","modified":"2026-04-22T18:25:45.941168Z","updated_at":"2026-11-02T15:54:02.312556Z"}]}}