CVE-2026-97313
Description
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.
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft azl3_bind_9.20.26-1 | No range specified | — |
| microsoft azl3_bind_9.20.29-1 | No range specified | — |
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