Resource exhaustion in ISC BIND - CVE-2026-5950
Published: May 22, 2026
Vulnerability identifier: #VU132114
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5950
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: ISC
Affected software:
ISC BIND
ISC BIND
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper control of resource consumption in the resolver state machine bad-server handling in BIND 9 when processing queries that trigger specific retry conditions. A remote attacker can send specially crafted queries to cause a denial of service.
Resolvers are affected, while authoritative services are believed to be unaffected.
How to mitigate CVE-2026-5950
Install security update from vendor's website.