CVE-2026-3104

A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://downloads.isc.org/isc/bind9/9.20.21	Patch
https://downloads.isc.org/isc/bind9/9.21.20	Patch
https://kb.isc.org/docs/cve-2026-3104	Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6935
https://access.redhat.com/security/cve/CVE-2026-3104
https://bugzilla.redhat.com/show_bug.cgi?id=2451310
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3104.json

Configurations

Configuration 1 (hide)

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

History

No history.

Information

Published : 2026-03-25 14:16

Updated : 2026-09-01 13:19

NVD link : CVE-2026-3104

Mitre link : CVE-2026-3104

CVE.ORG link : CVE-2026-3104

JSON object : View

Products Affected

isc

bind

CWE

CWE-772

Missing Release of Resource after Effective Lifetime

CWE-401

Missing Release of Memory after Effective Lifetime

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to cause a memory leak in a BIND resolver simply by querying this domain.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected."}, {"lang": "es", "value": "Un dominio especialmente dise\u00f1ado puede usarse para causar una fuga de memoria en un resolvedor BIND simplemente al consultar este dominio.\nEste problema afecta a las versiones de BIND 9 desde la 9.20.0 hasta la 9.20.20, desde la 9.21.0 hasta la 9.21.19, y desde la 9.20.9-S1 hasta la 9.20.20-S1.\nLas versiones de BIND 9 desde la 9.18.0 hasta la 9.18.46 y desde la 9.18.11-S1 hasta la 9.18.46-S1 NO se ven afectadas."}], "lastModified": "2026-09-01T13:19:16.763", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "2C0EF5D0-68A6-4E00-985B-523D9B243E49", "versionEndExcluding": "9.20.21", "versionStartIncluding": "9.20.0"}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "B1DD0950-5CBD-49B2-8007-5E96B3C4FB1B", "versionEndExcluding": "9.21.20", "versionStartIncluding": "9.21.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-officer@isc.org"}