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VULNERABILITIES

CVE-2026-5950 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://downloads.isc.org/isc/bind9/9.18.49 [email protected]Patch
https://downloads.isc.org/isc/bind9/9.20.23 [email protected]Patch
https://downloads.isc.org/isc/bind9/9.21.22 [email protected]Patch
https://kb.isc.org/docs/cve-2026-5950 [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-606Unchecked Input for Loop Condition[email protected]

Affected Products

ProductVersions
isc bind
>= 9.18.36, < 9.18.49
>= 9.20.8, < 9.20.23
>= 9.21.7, < 9.21.21

CPE

  • cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*

Remediation

  • No remediation found in references.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-5950
NVD Published Date:
May 20, 2026
NVD Last Modified:
Jul 23, 2026
Source:
[email protected]