Key Record using PRIVATEDNS algorithm may lead to unexpected exit

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-10822
StatePUBLISHED
Assignerisc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-22 15:16:51 UTC
Updated2026-07-22 20:33:11 UTC
DescriptionIf BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and may subsequently abort and exit. BIND will first need to store a DNS record for a key (KEY, DNSKEY, etc.). That key must specify a PRIVATEDNS algorithm (253), and in the algorithm identifier, improperly give a length longer than the actual identifier data. The invalid identifier will be stored. If BIND later needs to render that record to text, it will use the invalid length during processing, leading to a consistency check failing. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-617 | CWE-1284 | CWE-617 CWE-617 Reachable Assertion | CWE-1284 CWE-1284 Improper Validation of Specified Quantity in Input

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ISC BIND 9 affected 9.18.0 9.18.50 custom Not specified
CNA ISC BIND 9 affected 9.20.0 9.20.24 custom Not specified
CNA ISC BIND 9 affected 9.21.0 9.21.23 custom Not specified
CNA ISC BIND 9 affected 9.18.11-S1 9.18.50-S1 custom Not specified
CNA ISC BIND 9 affected 9.20.9-S1 9.20.24-S1 custom Not specified

References

ReferenceSourceLinkTags
kb.isc.org/docs/cve-2026-10822 [email protected] kb.isc.org
downloads.isc.org/isc/bind9/9.21.24 [email protected] downloads.isc.org
downloads.isc.org/isc/bind9/9.20.26 [email protected] downloads.isc.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.26, 9.21.24, or 9.20.26-S1.

Workarounds

CNA: No workarounds known.

Exploits

CNA: This flaw was discovered in internal testing. We are not aware of any active exploits.

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