{"id":"AZL-80987","summary":"CVE-2026-3591 affecting package bind for versions less than 9.20.21-1","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.\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.","modified":"2026-08-28T17:47:33.849228334Z","published":"2026-03-25T14:16:37Z","upstream":["CVE-2026-3591"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3591"}],"affected":[{"package":{"name":"bind","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/bind"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.20.21-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-80987.json"}}],"schema_version":"1.9.0"}