medium5.3
CVE-2026-5950
An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to ca…
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Isc | Bind | from 9.18.36 before 9.18.49 from 9.20.8 before 9.20.23 from 9.21.7 before 9.21.21 |