CVE-2026-5950
Published: May 20, 2026
Modified: May 20, 2026
CVSS v3.1
5.3
Description
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.
| Vendor | Product | Versions |
|---|---|---|
ISC | BIND 9 | affected 9.18.36 - <= 9.18.48affected 9.20.8 - <= 9.20.22affected 9.21.7 - <= 9.21.21affected 9.18.36-S1 - <= 9.18.48-S1affected 9.20.9-S1 - <= 9.20.22-S1 |
Weaknesses (CWE)
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
References
Security Training
Train your team to recognize and prevent security threats with our comprehensive security awareness program.
Start TrainingVulnerability Scanning
Discover vulnerabilities in your applications and infrastructure before attackers do.
Scan Now