Home/CVE/Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`
CVE
CVE-2026-5946
Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`
Multiple flaws have been identified in named related to the handling of DNS messages whose CLASS is not Internet (IN), for example, CHAOS or HESIOD, or DNS messages that specify meta-classes (ANY or NONE) in the question section. Specially crafted requests reaching the affected code paths, recursion, dynamic updates (UPDATE), zone change notifications (NOTIFY), or processing of IN-specific record types in non-IN data, can cause assertion failures in named. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
HIGH · CVSS 7.5
EPSS 0.0005
Schedule remediation
- SSVC automatable: yes - attacks can be scripted at scale
- CVSS base score ≥ 7.0
Sigma rules0
YARA rules0
Look this up elsewhere - one-click external pivots
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How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2026-5946, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked.
EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal.
CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score.
Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits.
PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
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ATT&CK techniques
8Techniques this CVE enables - linked via CWECAPECATT&CK. High◆ = named directly in ATT&CK or Nuclei templates.
T1027 · Obfuscated Files or Information T1036.001 · Invalid Code Signature T1190 · Exploit Public-Facing Application T1539 · Steal Web Session Cookie T1553.002 · Code Signing T1562.003 · Impair Command History Logging T1574.006 · Dynamic Linker Hijacking T1574.007 · Path Interception by PATH Environment Variable
▤ Build a SIEM detection for these techniques
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CAPEC attack patterns
12Attack patterns this CVE enables - the bridge from weakness to ATT&CK technique.
CAPEC-CAPEC-10 · Buffer Overflow via Environment Variables CAPEC-CAPEC-101 · Server Side Include (SSI) Injection CAPEC-CAPEC-104 · Cross Zone Scripting CAPEC-CAPEC-108 · Command Line Execution through SQL Injection CAPEC-CAPEC-109 · Object Relational Mapping Injection CAPEC-CAPEC-110 · SQL Injection through SOAP Parameter Tampering CAPEC-CAPEC-120 · Double Encoding CAPEC-CAPEC-13 · Subverting Environment Variable Values CAPEC-CAPEC-135 · Format String Injection CAPEC-CAPEC-136 · LDAP Injection CAPEC-CAPEC-14 · Client-side Injection-induced Buffer Overflow CAPEC-CAPEC-153 · Input Data Manipulation
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Weakness Classification
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Affected Products & Versions
4📦
Fixed versions by distribution
66The package version that resolves this CVE on each Linux distribution, from the vendor’s published security data. fixed in shows a patched version exists; open means the package is listed as affected with no fix yet.
alpine edgebind fixed in 9.20.23-r0
alpine v3.20bind fixed in 9.18.49-r0
oracle allbind open
oracle allbind-chroot open
oracle allbind-devel open
oracle allbind-export-devel fixed in 32:9.11.36-16.el8_10.8
oracle allbind-export-libs open
oracle allbind-libs fixed in 32:9.11.36-16.el8_10.8
oracle allbind-libs-lite open
oracle allbind-license fixed in 32:9.11.36-16.el8_10.8
oracle allbind-lite-devel open
oracle allbind-pkcs11 fixed in 32:9.11.36-16.el8_10.8
oracle allbind-pkcs11-devel fixed in 32:9.11.36-16.el8_10.8
oracle allbind-pkcs11-libs open
oracle allbind-pkcs11-utils open
oracle allbind-sdb fixed in 32:9.11.36-16.el8_10.8
oracle allbind-sdb-chroot fixed in 32:9.11.36-16.el8_10.8
oracle allbind-utils open
oracle allbind9.16 open
oracle allbind9.16-chroot fixed in 32:9.16.23-0.22.el8_10.6
oracle allbind9.16-devel open
oracle allbind9.16-dnssec-utils fixed in 32:9.16.23-0.22.el8_10.6
oracle allbind9.16-libs open
oracle allbind9.16-license fixed in 32:9.16.23-0.22.el8_10.6
oracle allbind9.16-utils open
oracle allpython3-bind open
oracle allpython3-bind9.16 open
rhel 8bind open
rhel 8bind-chroot open
rhel 8bind-devel fixed in 32:9.11.36-16.el8_10.8
rhel 8bind-export-devel fixed in 32:9.11.36-16.el8_10.8
rhel 8bind-export-libs fixed in 32:9.11.36-16.el8_10.8
rhel 8bind-libs open
rhel 8bind-libs-lite open
rhel 8bind-license fixed in 32:9.11.36-16.el8_10.8
rhel 8bind-lite-devel fixed in 32:9.11.36-16.el8_10.8
rhel 8bind-pkcs11 open
rhel 8bind-pkcs11-devel open
rhel 8bind-pkcs11-libs open
rhel 8bind-pkcs11-utils fixed in 32:9.11.36-16.el8_10.8
rhel 8bind-sdb fixed in 32:9.11.36-16.el8_10.8
rhel 8bind-sdb-chroot open
rhel 8bind-utils open
rhel 8bind9.16 open
rhel 8bind9.16-chroot open
rhel 8bind9.16-devel fixed in 32:9.16.23-0.22.el8_10.6
rhel 8bind9.16-dnssec-utils fixed in 32:9.16.23-0.22.el8_10.6
rhel 8bind9.16-libs open
rhel 8bind9.16-license fixed in 32:9.16.23-0.22.el8_10.6
rhel 8bind9.16-utils open
rhel 8python3-bind open
rhel 8python3-bind9.16 fixed in 32:9.16.23-0.22.el8_10.6
rhel 9bind fixed in 32:9.16.23-40.el9_8.2
rhel 9bind-chroot fixed in 32:9.16.23-40.el9_8.2
rhel 9bind-devel open
rhel 9bind-dnssec-utils open
rhel 9bind-libs open
rhel 9bind-license fixed in 32:9.16.23-40.el9_8.2
rhel 9bind-utils fixed in 32:9.16.23-40.el9_8.2
rhel 9bind9.18 open
rhel 9bind9.18-chroot fixed in 32:9.18.29-14.el9_8.2
rhel 9bind9.18-devel open
rhel 9bind9.18-dnssec-utils open
rhel 9bind9.18-libs fixed in 32:9.18.29-14.el9_8.2
rhel 9bind9.18-utils fixed in 32:9.18.29-14.el9_8.2
rhel 9python3-bind fixed in 32:9.16.23-40.el9_8.2
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Scoring & Timeline
7.5
HIGH · CVSS v3.1 · [email protected]
Attack Vector
Network
Adjacent
Local
Physical
Attack Complexity
Low
High
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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Vendor Advisories
10🔗
References & Sources
4Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://kb.isc.org/docs/cve-2026-5946Vendor Advisory