High · published May 20, 2026
BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processing maliciously-constructed packets. Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments.
This issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
| Product | Versions | Fixed in |
|---|---|---|
| isc/bind | ≥ 9.0.0, ≤ 9.16.50 | — |
| isc/bind | ≥ 9.18.0, < 9.18.49 | 9.18.49 |
| isc/bind | ≥ 9.20.0, < 9.20.23 | 9.20.23 |
| isc/bind | ≥ 9.21.0, < 9.21.22 | 9.21.22 |