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CVE Vulnerability Details :
CVE-2026-11331
PUBLISHED
More InfoOfficial Page
Assigner-isc
Assigner Org ID-404fd4d2-a609-4245-b543-2c944a302a22
View Known Exploited Vulnerability (KEV) details
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
Details not found