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A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade bind-pkcs11-libsUpgrade bind9.16-docUpgrade bind9.18-dnssec-utilsUpgrade bind-libs-liteUpgrade bind-lite-develUpgrade bind-dnssec-utilsUpgrade bind9.18-develUpgrade bind-export-develUpgrade bind9.16-develUpgrade bind-export-libsUpgrade bind-chrootUpgrade bind-utilsUpgrade bind-docUpgrade bind-pkcs11-develUpgrade bind9.18-docUpgrade bind9.16-libsUpgrade bind-dnssec-docUpgrade bind-sdbUpgrade bindUpgrade bind9.16Upgrade python3-bindUpgrade bind-libsUpgrade bind9.18-utilsUpgrade bind-licenseUpgrade bind9.18-chrootUpgrade bind9.16-licenseUpgrade bind-sdb-chrootUpgrade bind9.16-dnssec-utilsUpgrade bind-develUpgrade python3-bind9.16Upgrade bind9.18Upgrade bind-pkcs11-utilsUpgrade bind9.16-utilsUpgrade bind9.16-chrootUpgrade bind-pkcs11Upgrade bind9.18-libs | Oct 11, 2026 | Aug 13, 2026 |
| Alpine Linux | — | Upgrade bind | Jul 28, 2026 | Jul 22, 2026 |
| Amazon Linux Ami 2 | — | Upgrade bind-export-libsUpgrade bind-sdbUpgrade bindUpgrade bind-libs-liteUpgrade bind-pkcs11Upgrade bind-chrootUpgrade bind-debuginfoUpgrade bind-export-develUpgrade bind-lite-develUpgrade bind-pkcs11-develUpgrade bind-libsUpgrade bind-develUpgrade bind-sdb-chrootUpgrade bind-pkcs11-utilsUpgrade bind-licenseUpgrade bind-pkcs11-libsUpgrade bind-utils | Aug 5, 2026 | Aug 5, 2026 |
| Amazon_linux_2023 | — | Upgrade bind-libs-debuginfoUpgrade bind-debugsourceUpgrade bind-dnssec-utilsUpgrade bind-licenseUpgrade bind-dnssec-utils-debuginfoUpgrade bind-libsUpgrade bind-utils-debuginfoUpgrade bindUpgrade bind-chrootUpgrade bind-docUpgrade bind-debuginfoUpgrade bind-develUpgrade bind-utils | Aug 10, 2026 | Jul 22, 2026 |
| Debian | — | Upgrade bind9 | Jul 28, 2026 | Jul 28, 2026 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Sep 18, 2026 | Sep 17, 2026 |
| Ibm Aix | — | Apply the fix or workaround for bind_advisory31 | Sep 16, 2026 | Sep 16, 2026 |
| Oracle_linux | — | Upgrade bind-chrootUpgrade bind-export-libsUpgrade bind-libs-liteUpgrade bind-dnssec-docUpgrade bind-pkcs11-utilsUpgrade bind-sdbUpgrade bindUpgrade bind9.16-develUpgrade bind9.18-docUpgrade bind9.18-chrootUpgrade bind9.16-docUpgrade bind-utilsUpgrade bind-export-develUpgrade bind9.16-chrootUpgrade bind9.18-libsUpgrade bind-docUpgrade bind9.16-dnssec-utilsUpgrade bind9.16-libsUpgrade bind-lite-develUpgrade bind-pkcs11Upgrade bind-pkcs11-develUpgrade bind9.16-utilsUpgrade bind-sdb-chrootUpgrade bind-pkcs11-libsUpgrade bind-develUpgrade python3-bindUpgrade bind-libsUpgrade bind9.16-licenseUpgrade bind9.18-dnssec-utilsUpgrade bind9.18-utilsUpgrade bind-licenseUpgrade bind-dnssec-utilsUpgrade bind9.18-develUpgrade bind9.16Upgrade python3-bind9.16Upgrade bind9.18 | Oct 22, 2026 | Jul 22, 2026 |
| Redhat Openshift | — | Upgrade ose-rhel-coreos | Aug 26, 2026 | Jul 22, 2026 |
| Redhat_linux | — | Upgrade bind9.16-debugsourceUpgrade bind9.16-utilsUpgrade bind-libsUpgrade bind-sdbUpgrade bind9.18-chrootUpgrade bind-export-libs-debuginfoUpgrade bind-lite-develUpgrade bind9.16-develUpgrade bind-debuginfoUpgrade bind9.18-dnssec-utilsUpgrade bind-utilsUpgrade bind9.18-debuginfoUpgrade python3-bindUpgrade bind9.18-utils-debuginfoUpgrade bind-pkcs11-libs-debuginfoUpgrade bind9.18-docUpgrade bind-libs-lite-debuginfoUpgrade bind9.16-utils-debuginfoUpgrade bind-pkcs11-utils-debuginfoUpgrade bind-dnssec-docUpgrade bind-chrootUpgrade python3-bind9.16Upgrade bind-docUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind-pkcs11Upgrade bind9.18-debugsourceUpgrade bind9.16-chrootUpgrade bind-pkcs11-debuginfoUpgrade bind9.16Upgrade bind9.16-libs-debuginfoUpgrade bind-pkcs11-libsUpgrade bind-utils-debuginfoUpgrade bindUpgrade bind9.16-docUpgrade bind-sdb-debuginfoUpgrade bind9.18-dnssec-utils-debuginfoUpgrade bind-pkcs11-develUpgrade bind9.18Upgrade bind-dnssec-utilsNo solution existsUpgrade bind-pkcs11-utilsUpgrade bind9.18-develUpgrade bind-libs-debuginfoUpgrade bind9.18-libs-debuginfoUpgrade bind-libs-liteUpgrade bind9.18-libsUpgrade bind-sdb-chrootUpgrade bind9.16-dnssec-utilsUpgrade bind-dnssec-utils-debuginfoUpgrade bind-export-develUpgrade bind9.16-debuginfoUpgrade bind-export-libsUpgrade bind9.18-utilsUpgrade bind-debugsourceUpgrade bind-develUpgrade bind9.16-libsUpgrade bind-licenseUpgrade bind9.16-license | Jul 24, 2026 | Jul 22, 2026 |
| Rocky_linux | — | Upgrade bind9.18-dnssec-utils-debuginfoUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind9.16Upgrade bind9.18-debuginfoUpgrade bind-pkcs11-utilsUpgrade bind9.18-chrootUpgrade bind-utilsUpgrade bind-lite-develUpgrade bind-pkcs11-utils-debuginfoUpgrade bind9.18-debugsourceUpgrade bind9.16-utils-debuginfoUpgrade bind-pkcs11-libsUpgrade bind9.16-develUpgrade bind-debuginfoUpgrade bind-pkcs11-debuginfoUpgrade bind9.18-dnssec-utilsUpgrade bind9.18-utils-debuginfoUpgrade bind-chrootUpgrade bind-libsUpgrade bind-pkcs11-libs-debuginfoUpgrade bind-libs-liteUpgrade bind9.16-libs-debuginfoUpgrade bind-export-libs-debuginfoUpgrade bind-libs-lite-debuginfoUpgrade bind9.16-debugsourceUpgrade bind-sdbUpgrade bind-sdb-debuginfoUpgrade bind9.18-utilsUpgrade bind-utils-debuginfoUpgrade bind-dnssec-utils-debuginfoUpgrade bind9.16-chrootUpgrade bindUpgrade bind-sdb-chrootUpgrade bind-export-libsUpgrade bind9.16-libsUpgrade bind-debugsourceUpgrade bind9.16-debuginfoUpgrade bind-develUpgrade bind-pkcs11Upgrade bind9.16-utilsUpgrade bind9.18-libsUpgrade bind-libs-debuginfoUpgrade bind-export-develUpgrade bind-dnssec-utilsUpgrade bind9.18-libs-debuginfoUpgrade bind9.18-develUpgrade bind9.18Upgrade bind-pkcs11-develUpgrade bind9.16-dnssec-utils | Aug 17, 2026 | Aug 15, 2026 |
| Ubuntu | — | Upgrade bind9 (Ubuntu Pro)Upgrade bind9 | Aug 19, 2026 | Aug 19, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 17, 2026 | Jul 22, 2026 |
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