An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade bind | May 25, 2026 | May 20, 2026 |
| Amazon Linux Ami 2 | — | Upgrade bind-pkcs11-libsUpgrade bind-sdb-chrootUpgrade bind-export-libsUpgrade bind-licenseUpgrade bind-pkcs11-develUpgrade bind-export-develUpgrade bind-debuginfoUpgrade bindUpgrade bind-lite-develUpgrade bind-chrootUpgrade bind-libs-liteUpgrade bind-libsUpgrade bind-pkcs11-utilsUpgrade bind-develUpgrade bind-sdbUpgrade bind-pkcs11Upgrade bind-utils | Jun 9, 2026 | Jun 9, 2026 |
| Amazon_linux_2023 | — | Upgrade bind-docUpgrade bind-dnssec-utilsUpgrade bind-debugsourceUpgrade bind-debuginfoUpgrade bind-licenseUpgrade bind-utils-debuginfoUpgrade bindUpgrade bind-libsUpgrade bind-dnssec-utils-debuginfoUpgrade bind-chrootUpgrade bind-utilsUpgrade bind-libs-debuginfoUpgrade bind-devel | May 28, 2026 | May 20, 2026 |
| Debian | — | Upgrade bind9 | May 24, 2026 | May 24, 2026 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Aug 13, 2026 | Aug 12, 2026 |
| Ibm Aix | — | Apply the fix or workaround for bind_advisory30 | Jun 29, 2026 | Jun 29, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | May 26, 2026 |
| Ubuntu | — | Upgrade bind9 | May 25, 2026 | May 21, 2026 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub