Out-of-zone database nodes can become authoritative zone cuts

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-78301
StatePUBLISHED
Assignerisc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 14:17:10 UTC
Updated2026-09-17 19:16:59 UTC
DescriptionA malformed zone may contain an NS or DNAME node above its origin, which `named` treats as a zone cut. If an attacker inserts a malformed zone into a BIND authoritative server (e.g., via zone transfer), queries for names inside the configured zone then lose authoritative status and return an out-of-zone delegation. On a server that also provides recursion BIND can follow this locally sourced cut and cache attacker-supplied data, affecting names outside the configured zone. This situation persists as long as the malformed zone remains in the zone database. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

Risk And Classification

Primary CVSS: v3.1 5.8 MEDIUM from [email protected]

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

EPSS: 0.001810000 probability, percentile 0.079530000 (date 2026-09-20)

Problem Types: CWE-349 | CWE-349 CWE-349 Acceptance of Extraneous Untrusted Data With Trusted Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N
3.1CNADECLARED5.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ISC BIND 9 affected 9.11.0 9.18.50 custom Not specified
CNA ISC BIND 9 affected 9.20.0 9.20.27 custom Not specified
CNA ISC BIND 9 affected 9.21.0 9.21.25 custom Not specified
CNA ISC BIND 9 affected 9.11.3-S1 9.18.50-S1 custom Not specified
CNA ISC BIND 9 affected 9.20.9-S1 9.20.27-S1 custom Not specified

References

ReferenceSourceLinkTags
downloads.isc.org/isc/bind9/9.20.29 [email protected] downloads.isc.org
kb.isc.org/docs/cve-2026-78301 [email protected] kb.isc.org
downloads.isc.org/isc/bind9/9.21.26 [email protected] downloads.isc.org
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 Henrique Pereira 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: 9.20.29, 9.21.26, or 9.20.29-S1.

Workarounds

CNA: No workarounds known.

Exploits

CNA: We are not aware of any active exploits.

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