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A recursive BIND server that receives a query with recursion desired (RD=1) followed by a non-recursive query (RD=0) may exit with an assertion failure, resulting in a denial of service. To be vulnerable, the BIND server must allow recursive queries and have at least two RPZ zones configured: one with the default setting of "recursive-only yes", and the other with "recursive-only no". This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade bind | Oct 28, 2026 | Oct 21, 2026 |
| Amazon_linux_2023 | — | Upgrade bind-chrootUpgrade bind-dnssec-utilsUpgrade bind-docUpgrade bind-utilsUpgrade bind-licenseUpgrade bind-libs-debuginfoUpgrade bindUpgrade bind-develUpgrade bind-libsUpgrade bind-debugsourceUpgrade bind-utils-debuginfoUpgrade bind-dnssec-utils-debuginfoUpgrade bind-debuginfo | Oct 28, 2026 | Oct 21, 2026 |
| Oracle_linux | — | Upgrade bind-develUpgrade bind-utilsUpgrade bind-chrootUpgrade bindUpgrade bind-dnssec-utilsUpgrade bind-docUpgrade bind-libsUpgrade bind-license | Oct 30, 2026 | Oct 21, 2026 |
| Redhat_linux | — | No solution exists | Oct 23, 2026 | Oct 21, 2026 |
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