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CVE-2026-11331· NVD / CVE Program· CNA isc

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.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jul 22, 2026
Updated
Jul 22, 2026
EPSS
0.4% · 35th percentile
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · isc
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (isc). Independent of NVD's CPE analysis and usually ahead of it.

  • ISC BIND 9

    • 9.16.0 and later · up to and including 9.18.50affected
    • 9.20.0 and later · up to and including 9.20.24affected
    • 9.21.0 and later · up to and including 9.21.23affected
    • 9.16.8-S1 and later · up to and including 9.18.50-S1affected
    • 9.20.9-S1 and later · up to and including 9.20.24-S1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10bindbefore 32:9.18.33-15.el10_2.1032:9.18.33-15.el10_2.10
AlmaLinux:10bind-chrootbefore 32:9.18.33-15.el10_2.1032:9.18.33-15.el10_2.10
AlmaLinux:10bind-develbefore 32:9.18.33-15.el10_2.1032:9.18.33-15.el10_2.10
AlmaLinux:10bind-dnssec-utilsbefore 32:9.18.33-15.el10_2.1032:9.18.33-15.el10_2.10
AlmaLinux:10bind-docbefore 32:9.18.33-15.el10_2.1032:9.18.33-15.el10_2.10
AlmaLinux:10bind-libsbefore 32:9.18.33-15.el10_2.1032:9.18.33-15.el10_2.10
AlmaLinux:10bind-licensebefore 32:9.18.33-15.el10_2.1032:9.18.33-15.el10_2.10
AlmaLinux:10bind-utilsbefore 32:9.18.33-15.el10_2.1032:9.18.33-15.el10_2.10
AlmaLinux:8bind9.16before 32:9.16.23-0.22.el8_10.1232:9.16.23-0.22.el8_10.12
AlmaLinux:8bind9.16-chrootbefore 32:9.16.23-0.22.el8_10.1232:9.16.23-0.22.el8_10.12
AlmaLinux:8bind9.16-develbefore 32:9.16.23-0.22.el8_10.1232:9.16.23-0.22.el8_10.12
AlmaLinux:8bind9.16-dnssec-utilsbefore 32:9.16.23-0.22.el8_10.1232:9.16.23-0.22.el8_10.12
AlmaLinux:8bind9.16-docbefore 32:9.16.23-0.22.el8_10.1232:9.16.23-0.22.el8_10.12
AlmaLinux:8bind9.16-libsbefore 32:9.16.23-0.22.el8_10.1232:9.16.23-0.22.el8_10.12
AlmaLinux:8bind9.16-licensebefore 32:9.16.23-0.22.el8_10.1232:9.16.23-0.22.el8_10.12
AlmaLinux:8bind9.16-utilsbefore 32:9.16.23-0.22.el8_10.1232:9.16.23-0.22.el8_10.12
AlmaLinux:8python3-bind9.16before 32:9.16.23-0.22.el8_10.1232:9.16.23-0.22.el8_10.12
AlmaLinux:9bindbefore 32:9.16.23-40.el9_8.832:9.16.23-40.el9_8.8
AlmaLinux:9bind-chrootbefore 32:9.16.23-40.el9_8.832:9.16.23-40.el9_8.8
AlmaLinux:9bind-develbefore 32:9.16.23-40.el9_8.832:9.16.23-40.el9_8.8
AlmaLinux:9bind-dnssec-docbefore 32:9.16.23-40.el9_8.832:9.16.23-40.el9_8.8
AlmaLinux:9bind-dnssec-utilsbefore 32:9.16.23-40.el9_8.832:9.16.23-40.el9_8.8
AlmaLinux:9bind-docbefore 32:9.16.23-40.el9_8.832:9.16.23-40.el9_8.8
AlmaLinux:9bind-libsbefore 32:9.16.23-40.el9_8.832:9.16.23-40.el9_8.8

+96

Same product

isc: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-12705DNS-over-HTTPS implementation suffers from multiple issues under heavy query load
    36Monitor
  • CVE-2025-40775DNS message with invalid TSIG causes an assertion failure
    35Monitor
  • CVE-2024-11187Many records in the additional section cause CPU exhaustion
    35Monitor
  • CVE-2026-13321DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
    34Monitor
  • CVE-2025-40780Cache poisoning due to weak PRNG
    34Monitor
  • CVE-2025-40778Cache poisoning attacks with unsolicited RRs
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 bind 9.20.23-1 on Azure Linux 3.09.20.26-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bind32:9.16.23-40.el9_8.8 · AlmaLinux:9Package registry (OSV)
almalinux:bind-chroot32:9.16.23-40.el9_8.8 · AlmaLinux:9Package registry (OSV)
almalinux:bind-devel32:9.16.23-40.el9_8.8 · AlmaLinux:9Package registry (OSV)
almalinux:bind9.1632:9.16.23-0.22.el8_10.12 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-chroot32:9.16.23-0.22.el8_10.12 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-devel32:9.16.23-0.22.el8_10.12 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-dnssec-utils32:9.16.23-0.22.el8_10.12 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-doc32:9.16.23-0.22.el8_10.12 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-libs32:9.16.23-0.22.el8_10.12 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-license32:9.16.23-0.22.el8_10.12 · AlmaLinux:8Package registry (OSV)
almalinux:bind9.16-utils32:9.16.23-0.22.el8_10.12 · AlmaLinux:8Package registry (OSV)
almalinux:python3-bind9.1632:9.16.23-0.22.el8_10.12 · AlmaLinux:8Package registry (OSV)
alpine:bind9.20.26-r0 · Alpine:v3.22Package registry (OSV)
debian:bind91:9.18.49-1~deb12u2 · Debian:12Package registry (OSV)
opensuse:bind9.20.26-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:bind0:9.20.26-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:bind-doc0:9.20.26-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:bind9.1632:9.16.23-0.22.el8_10.12 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-chroot32:9.16.23-0.22.el8_10.12 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-debuginfo32:9.16.23-0.22.el8_10.12 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-debugsource32:9.16.23-0.22.el8_10.12 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-dnssec-utils32:9.16.23-0.22.el8_10.12 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-dnssec-utils-debuginfo32:9.16.23-0.22.el8_10.12 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-libs32:9.16.23-0.22.el8_10.12 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-libs-debuginfo32:9.16.23-0.22.el8_10.12 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-license32:9.16.23-0.22.el8_10.12 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:bind9.16-utils32:9.16.23-0.22.el8_10.12 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:bind2:9.16.23-40.el9_8.8 · Rocky Linux:9Package registry (OSV)
rocky linux:bind9.162:9.16.23-0.22.el8_10.12 · Rocky Linux:8Package registry (OSV)

+2

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-790 · Improper Filtering of Special Elements

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records