Security Advisory

CVE-2026-5950

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-20 13:10:19

Last updated 2026-05-20 13:38:53

Assigner isc

CVSS score 5.3

State PUBLISHED

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.

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