CVE-2026-5950

Published May 20, 2026·Updated Jul 23, 2026

NVD 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.

Public Exploits & PoCs1 found

[POC] CVE-2026-5950 — cve-2026-5950-bind9-resolver-dos

Defensive research notes for CVE-2026-5950, a BIND 9 resolver DoS vulnerability credited to Billy Baraja (BielraX).

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

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