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CVE-2026-5950

MediumPublished

Unbounded resend loop in BIND 9 resolver

Published: May 20, 2026
Updated: May 20, 2026
Assigning CNA: isc
Evidence observed: Aug 8, 2026

Primary CVSS

5.3/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

0.7%

Low · next 30 days

Percentile: 49.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

cve-2026-5950-bind9-resolver-dosInformational
Defensive research notes for CVE-2026-5950, a BIND 9 resolver DoS vulnerability credited to Billy Baraja (BielraX).

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