Authenticated query containing a TKEY record may cause named to terminate unexpectedly

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Summary

CVECVE-2026-3119
StatePUBLISHED
Assignerisc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-25 14:16:37 UTC
Updated2026-05-21 15:24:39 UTC
DescriptionUnder certain conditions, `named` may crash when processing a correctly signed query containing a TKEY record. The affected code can only be reached if an incoming request has a valid transaction signature (TSIG) from a key declared in the `named` configuration. 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 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-617 | CWE-617 CWE-617 Reachable Assertion

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:L/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-2026-3119 [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: Remove any TSIG keys that might be used by an attacker.

Exploits

CNA: We are not aware of any active exploits.

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