Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| ISC / BIND 9 | affected 9.18.36 through 9.18.48; affected 9.20.8 through 9.20.22; affected 9.21.7 through 9.21.21; affected 9.18.36-S1 through 9.18.48-S1; affected 9.20.9-S1 through 9.20.22-S1 |
CWE
CWE-606
References
- https://kb.isc.org/docs/cve-2026-5950
- https://downloads.isc.org/isc/bind9/9.18.49
- https://downloads.isc.org/isc/bind9/9.20.23
- https://downloads.isc.org/isc/bind9/9.21.22
ADP enrichment
No English description supplied.
No references supplied.