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Vulnerability Details :

CVE-2026-11331

Summary
Assigner-isc
Assigner Org ID-404fd4d2-a609-4245-b543-2c944a302a22
Published At-22 Jul, 2026 | 14:10
Updated At-22 Jul, 2026 | 18:54
Rejected At-
Credits

Potential wildcard CNAME RPZ policy bypass

An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:isc
Assigner Org ID:404fd4d2-a609-4245-b543-2c944a302a22
Published At:22 Jul, 2026 | 14:10
Updated At:22 Jul, 2026 | 18:54
Rejected At:
▼CVE Numbering Authority (CNA)
Potential wildcard CNAME RPZ policy bypass

An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

Affected Products
Vendor
Internet Systems Consortium, Inc.ISC
Product
BIND 9
Default Status
unaffected
Versions
Affected
  • From 9.16.0 through 9.18.50 (custom)
  • From 9.20.0 through 9.20.24 (custom)
  • From 9.21.0 through 9.21.23 (custom)
  • From 9.16.8-S1 through 9.18.50-S1 (custom)
  • From 9.20.9-S1 through 9.20.24-S1 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-790CWE-790 Improper Filtering of Special Elements
Type: CWE
CWE ID: CWE-790
Description: CWE-790 Improper Filtering of Special Elements
Metrics
VersionBase scoreBase severityVector
3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
N/AIf such a situation is encountered, the targeted RPZ rule may be bypassed. The condition could also lead to an unexpected exit.
CAPEC ID: N/A
Description: If such a situation is encountered, the targeted RPZ rule may be bypassed. The condition could also lead to an unexpected exit.
Solutions

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.

Configurations
Workarounds

No workarounds known.

Exploits

We are not aware of any active exploits.

Credits
ISC would like to thank Laith Mash'al (0xmshal) for bringing this vulnerability to our attention.
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://kb.isc.org/docs/cve-2026-11331
vendor-advisory
https://downloads.isc.org/isc/bind9/9.20.26
patch
https://downloads.isc.org/isc/bind9/9.21.24
patch
Hyperlink: https://kb.isc.org/docs/cve-2026-11331
Resource:
vendor-advisory
Hyperlink: https://downloads.isc.org/isc/bind9/9.20.26
Resource:
patch
Hyperlink: https://downloads.isc.org/isc/bind9/9.21.24
Resource:
patch
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-officer@isc.org
Published At:22 Jul, 2026 | 15:16
Updated At:22 Jul, 2026 | 19:16

An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
N/A
Type: Secondary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-790Secondarysecurity-officer@isc.org
CWE ID: CWE-790
Type: Secondary
Source: security-officer@isc.org
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://downloads.isc.org/isc/bind9/9.20.26security-officer@isc.org
N/A
https://downloads.isc.org/isc/bind9/9.21.24security-officer@isc.org
N/A
https://kb.isc.org/docs/cve-2026-11331security-officer@isc.org
N/A
Hyperlink: https://downloads.isc.org/isc/bind9/9.20.26
Source: security-officer@isc.org
Resource: N/A
Hyperlink: https://downloads.isc.org/isc/bind9/9.21.24
Source: security-officer@isc.org
Resource: N/A
Hyperlink: https://kb.isc.org/docs/cve-2026-11331
Source: security-officer@isc.org
Resource: N/A

Change History

0
Information is not available yet

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1Records found
CVE-2026-2328
Matching Score-4
Assigner-CERT@VDE
ShareView Details
Matching Score-4
Assigner-CERT@VDE
CVSS Score-7.5||HIGH
EPSS-0.31% / 22.99%
||
7 Day CHG~0.00%
Published-30 Mar, 2026 | 06:55
Updated-30 Mar, 2026 | 18:08
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Backend Access Due to Insufficient Input Validation

An unauthenticated remote attacker can exploit insufficient input validation to access backend components beyond their intended scope via path traversal, resulting in exposure of sensitive information.

Action-Not Available
Vendor-WAGO
Product-Solution BuilderDevice Sphere
CWE ID-CWE-790
Improper Filtering of Special Elements
Details not found