Memory leak in code preparing DNSSEC proofs of non-existence

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-3104
StatePUBLISHED
Assignerisc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-25 14:16:36 UTC
Updated2026-05-21 15:26:06 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-772 | CWE-401 | CWE-772 CWE-772 Missing Release of Resource after Effective Lifetime

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Isc Bind All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ISC BIND 9 affected 9.20.0 9.20.20 custom Not specified
CNA ISC BIND 9 affected 9.21.0 9.21.19 custom Not specified
CNA ISC BIND 9 affected 9.20.9-S1 9.20.20-S1 custom Not specified
CNA ISC BIND 9 unaffected 9.18.0 9.18.46 custom Not specified
CNA ISC BIND 9 unaffected 9.18.11-S1 9.18.46-S1 custom Not specified

References

ReferenceSourceLinkTags
downloads.isc.org/isc/bind9/9.20.21 [email protected] downloads.isc.org Patch
downloads.isc.org/isc/bind9/9.21.20 [email protected] downloads.isc.org Patch
kb.isc.org/docs/cve-2026-3104 [email protected] kb.isc.org Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention. (en)

Additional Advisory Data

Solutions

CNA: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.21, 9.21.20, or 9.20.21-S1.

Workarounds

CNA: No workarounds known.

Exploits

CNA: We are not aware of any active exploits.

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