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.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade bind | Jul 28, 2026 | Jul 22, 2026 |
| Amazon Linux Ami 2 | — | Upgrade bind-export-develUpgrade bind-lite-develUpgrade bind-libs-liteUpgrade bind-sdbUpgrade bind-debuginfoUpgrade bindUpgrade bind-chrootUpgrade bind-export-libsUpgrade bind-pkcs11Upgrade bind-pkcs11-libsUpgrade bind-utilsUpgrade bind-libsUpgrade bind-sdb-chrootUpgrade bind-pkcs11-develUpgrade bind-licenseUpgrade bind-develUpgrade bind-pkcs11-utils | Aug 5, 2026 | Aug 5, 2026 |
| Amazon_linux_2023 | — | Upgrade bind-develUpgrade bind-debuginfoUpgrade bind-chrootUpgrade bind-utilsUpgrade bind-docUpgrade bind-dnssec-utilsUpgrade bind-debugsourceUpgrade bind-utils-debuginfoUpgrade bind-dnssec-utils-debuginfoUpgrade bind-libs-debuginfoUpgrade bind-licenseUpgrade bind-libsUpgrade bind | 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 rhcos | Aug 26, 2026 | Jul 22, 2026 |
| Redhat_linux | — | Upgrade bind-sdbUpgrade bind-utilsUpgrade python3-bind9.16Upgrade bind-dnssec-docUpgrade bind-pkcs11Upgrade bind-lite-develUpgrade bind-docUpgrade bind9.18-debuginfoUpgrade bind-chrootUpgrade bind9.18-debugsourceUpgrade bind9.18-utils-debuginfoUpgrade bind-debuginfoUpgrade bind-pkcs11-libsUpgrade bind9.16-utilsUpgrade bind-pkcs11-libs-debuginfoUpgrade bind-libsUpgrade bind-libs-lite-debuginfoUpgrade bind9.16Upgrade bind9.16-utils-debuginfoUpgrade bind9.16-debugsourceUpgrade bind9.18-chrootUpgrade bind9.18-docUpgrade bind9.18-dnssec-utilsUpgrade bind-export-libs-debuginfoUpgrade bind-pkcs11-utils-debuginfoUpgrade python3-bindUpgrade bind9.16-libs-debuginfoUpgrade bind9.16-develUpgrade bind9.16-chrootUpgrade bind-pkcs11-debuginfoUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind-export-libsUpgrade bind-utils-debuginfoUpgrade bind9.16-debuginfoUpgrade bind-pkcs11-develUpgrade bind-dnssec-utilsNo solution existsUpgrade bind9.18-libs-debuginfoUpgrade bind9.16-dnssec-utilsUpgrade bind9.18-dnssec-utils-debuginfoUpgrade bind9.16-docUpgrade bind9.18-libsUpgrade bind-libs-liteUpgrade bind-libs-debuginfoUpgrade bind-sdb-debuginfoUpgrade bind-sdb-chrootUpgrade bind-export-develUpgrade bind-dnssec-utils-debuginfoUpgrade bind9.16-licenseUpgrade bind9.18Upgrade bind-debugsourceUpgrade bindUpgrade bind9.16-libsUpgrade bind9.18-utilsUpgrade bind-licenseUpgrade bind-develUpgrade bind-pkcs11-utilsUpgrade bind9.18-devel | Jul 24, 2026 | Jul 22, 2026 |
| Rocky_linux | — | Upgrade bind-develUpgrade bind9.18-libsUpgrade bind-export-develUpgrade bind9.16-libsUpgrade bind-pkcs11Upgrade bind-dnssec-utils-debuginfoUpgrade bind9.18-libs-debuginfoUpgrade bind9.16-dnssec-utilsUpgrade bind9.18Upgrade bind9.18-develUpgrade bindUpgrade bind-libs-debuginfoUpgrade bind-utils-debuginfoUpgrade bind-dnssec-utilsUpgrade bind9.16-debuginfoUpgrade bind-pkcs11-develUpgrade bind9.16-chrootUpgrade bind-sdb-chrootUpgrade bind-export-libsUpgrade bind-debugsourceUpgrade bind9.18-utilsUpgrade bind-sdb-debuginfoUpgrade bind9.16-utilsUpgrade bind-chrootUpgrade bind9.18-dnssec-utilsUpgrade bind9.16-develUpgrade bind9.18-utils-debuginfoUpgrade bind-pkcs11-libsUpgrade bind9.16Upgrade bind-libs-liteUpgrade bind9.16-dnssec-utils-debuginfoUpgrade bind-libs-lite-debuginfoUpgrade bind-export-libs-debuginfoUpgrade bind9.16-debugsourceUpgrade bind9.18-debuginfoUpgrade bind9.16-libs-debuginfoUpgrade bind9.18-dnssec-utils-debuginfoUpgrade bind-lite-develUpgrade bind-utilsUpgrade bind-sdbUpgrade bind9.18-chrootUpgrade bind-pkcs11-utilsUpgrade bind9.18-debugsourceUpgrade bind9.16-utils-debuginfoUpgrade bind-pkcs11-utils-debuginfoUpgrade bind-pkcs11-libs-debuginfoUpgrade bind-pkcs11-debuginfoUpgrade bind-debuginfoUpgrade bind-libs | Aug 17, 2026 | Aug 15, 2026 |
| Ubuntu | — | 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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