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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-libsUpgrade bind-pkcs11-utilsUpgrade bind9.16-dnssec-utilsUpgrade bind9.18Upgrade bind9.16-chrootUpgrade bind9.16-utilsUpgrade python3-bindUpgrade bind9.18-chrootUpgrade bind-pkcs11Upgrade bindUpgrade bind-develUpgrade bind9.18-libsUpgrade bind9.16Upgrade python3-bind9.16Upgrade bind9.16-licenseUpgrade bind-sdb-chrootUpgrade bind9.18-utilsUpgrade bind-licenseUpgrade bind9.18-develUpgrade bind-dnssec-docUpgrade bind-lite-develUpgrade bind9.16-libsUpgrade bind-pkcs11-develUpgrade bind-libs-liteUpgrade bind-sdbUpgrade bind9.16-docUpgrade bind9.16-develUpgrade bind-docUpgrade bind9.18-docUpgrade bind-utilsUpgrade bind-export-develUpgrade bind-chrootUpgrade bind9.18-dnssec-utilsUpgrade bind-pkcs11-libsUpgrade bind-dnssec-utilsUpgrade bind-export-libs | Oct 11, 2026 | Aug 13, 2026 |
| Alpine Linux | — | Upgrade bind | Jul 28, 2026 | Jul 22, 2026 |
| Amazon Linux Ami 2 | — | Upgrade bind-pkcs11Upgrade bind-chrootUpgrade bind-export-develUpgrade bind-debuginfoUpgrade bind-lite-develUpgrade bind-sdbUpgrade bind-libs-liteUpgrade bind-export-libsUpgrade bindUpgrade bind-sdb-chrootUpgrade bind-pkcs11-develUpgrade bind-libsUpgrade bind-utilsUpgrade bind-licenseUpgrade bind-pkcs11-libsUpgrade bind-pkcs11-utilsUpgrade bind-devel | Aug 5, 2026 | Aug 5, 2026 |
| Amazon_linux_2023 | — | Upgrade bind-debugsourceUpgrade bindUpgrade bind-libsUpgrade bind-licenseUpgrade bind-libs-debuginfoUpgrade bind-dnssec-utilsUpgrade bind-utils-debuginfoUpgrade bind-dnssec-utils-debuginfoUpgrade bind-utilsUpgrade bind-develUpgrade bind-debuginfoUpgrade bind-chrootUpgrade bind-doc | 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 |
| Redhat Openshift | — | Upgrade ose-rhel-coreos | Aug 26, 2026 | Jul 22, 2026 |
| Redhat_linux | — | Upgrade bind9.18-develUpgrade bind-utils-debuginfoUpgrade bind9.16-debuginfoUpgrade bind-debugsourceUpgrade bind9.18-libs-debuginfoUpgrade bind9.16-licenseUpgrade bind9.18-libsUpgrade bind9.18-dnssec-utils-debuginfoUpgrade bind9.16-dnssec-utilsUpgrade bind-develUpgrade bind-libs-liteUpgrade bind9.16-libsUpgrade bind9.18-utilsUpgrade bind9.16-docUpgrade bind-libs-debuginfoUpgrade bind-pkcs11-develUpgrade bindUpgrade bind-export-develUpgrade bind-licenseUpgrade bind-pkcs11-utilsUpgrade bind-sdb-debuginfoUpgrade bind-dnssec-utils-debuginfoUpgrade bind9.18Upgrade bind-export-libsUpgrade bind-sdb-chrootUpgrade bind-dnssec-utilsNo solution existsUpgrade bind9.18-dnssec-utilsUpgrade bind-docUpgrade python3-bind9.16Upgrade bind9.16-chrootUpgrade bind9.18-debugsourceUpgrade bind-pkcs11-libs-debuginfoUpgrade bind-libs-lite-debuginfoUpgrade bind9.18-docUpgrade bind-pkcs11-utils-debuginfoUpgrade bind9.18-utils-debuginfoUpgrade bind-dnssec-docUpgrade bind-pkcs11-debuginfoUpgrade bind-debuginfoUpgrade bind9.16-libs-debuginfoUpgrade python3-bindUpgrade bind9.16-utils-debuginfoUpgrade bind-chrootUpgrade bind9.18-debuginfoUpgrade bind-pkcs11Upgrade bind-lite-develUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind9.16Upgrade bind-pkcs11-libsUpgrade bind9.18-chrootUpgrade bind-export-libs-debuginfoUpgrade bind9.16-develUpgrade bind9.16-utilsUpgrade bind-sdbUpgrade bind9.16-debugsourceUpgrade bind-libsUpgrade bind-utils | Jul 24, 2026 | Jul 22, 2026 |
| Rocky_linux | — | Upgrade bind-pkcs11-libsUpgrade bind9.18-dnssec-utilsUpgrade bind9.18-utils-debuginfoUpgrade bind-pkcs11-utilsUpgrade bind9.18-debuginfoUpgrade bind9.18-dnssec-utils-debuginfoUpgrade bind-libs-lite-debuginfoUpgrade bind-libs-liteUpgrade bind9.16-libs-debuginfoUpgrade bind9.16-debugsourceUpgrade bind-chrootUpgrade bind-export-libs-debuginfoUpgrade bind-sdbUpgrade bind9.16Upgrade bind-libsUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind9.16-develUpgrade bind-pkcs11-libs-debuginfoUpgrade bind-pkcs11-utils-debuginfoUpgrade bind-lite-develUpgrade bind-utilsUpgrade bind9.18-chrootUpgrade bind-debuginfoUpgrade bind9.16-utils-debuginfoUpgrade bind9.18-debugsourceUpgrade bind-pkcs11-debuginfoUpgrade bind-develUpgrade bind-dnssec-utilsUpgrade bind9.18-develUpgrade bind9.18Upgrade bind-libs-debuginfoUpgrade bind9.18-utilsUpgrade bind-sdb-debuginfoUpgrade bind-pkcs11Upgrade bind-export-develUpgrade bindUpgrade bind9.16-chrootUpgrade bind9.16-libsUpgrade bind-utils-debuginfoUpgrade bind9.16-utilsUpgrade bind-sdb-chrootUpgrade bind-export-libsUpgrade bind-debugsourceUpgrade bind9.16-debuginfoUpgrade bind-dnssec-utils-debuginfoUpgrade bind9.16-dnssec-utilsUpgrade bind9.18-libsUpgrade bind-pkcs11-develUpgrade bind9.18-libs-debuginfo | 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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