{"id":"DEBIAN-CVE-2026-3591","details":"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.","modified":"2026-09-14T17:03:28.737927736Z","published":"2026-03-25T14:16:37.297Z","upstream":["CVE-2026-3591"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-3591"}],"affected":[{"package":{"name":"bind9","ecosystem":"Debian:13","purl":"pkg:deb/debian/bind9?arch=source&distro=trixie"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3591.json"}},{"package":{"name":"bind9","ecosystem":"Debian:14","purl":"pkg:deb/debian/bind9?arch=source&distro=forky"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3591.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"}]}