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.
CVSS Details
- CVSS 3.1 Base Score: 5.4
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade bind | Mar 27, 2026 | Mar 25, 2026 |
| Debian | — | Upgrade bind9 | Jul 23, 2026 | Jul 23, 2026 |
| Suse | — | Upgrade bind-modules-perlUpgrade bind-modules-ldapUpgrade bindUpgrade bind-modules-bdbhptUpgrade bind-modules-genericUpgrade bind-modules-mysqlUpgrade bind-docUpgrade bind-modules-sqlite3Upgrade bind-utils | Apr 16, 2026 | Apr 15, 2026 |
| Ubuntu | — | Upgrade bind9 | Mar 27, 2026 | Mar 25, 2026 |
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