CVE-2026-11331
published 2026-07-22CVE-2026-11331: 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…
PriorityP347high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
0.43%
35.9th percentile
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
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| isc | bind | — | — |
| isc | bind_9 | 9.16.0 – 9.18.50 | — |
| isc | bind_9 | 9.16.8-S1 – 9.18.50-S1 | — |
| isc | bind_9 | 9.20.0 – 9.20.24 | — |
| isc | bind_9 | 9.20.9-S1 – 9.20.24-S1 | — |
| isc | bind_9 | 9.21.0 – 9.21.23 | — |
| ubuntu | bind9 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vendor_redhat7.5HIGH
vendor_ubuntu6.8MEDIUM
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Ubuntu
Bind vulnerabilities
vendor_ubuntu·2026-08-19·CVSS 6.8
CVE-2026-11721 [MEDIUM] Bind vulnerabilities
Title: Bind vulnerabilities
Summary: Several security issues were fixed in Bind.
It was discovered that Bind incorrectly accepted NSEC3 records whose signer
name did not match the owning zone. A remote attacker could possibly use
this issue to perform NSEC3 impersonation attacks, bypassing DNSSEC
validation. (CVE-2026-10723)
It was discovered that Bind incorrectly handled Key Records using the
PRIVATEDNS algorithm. A remote attacker could possibly use this issue to
cause Bind to crash, resulting in a denial of service. (CVE-2026-10822)
It was discovered that Bind incorrectly handled wildcard CNAME expansion in
Response Policy Zones. A remote attacker could possibly use this issue to
bypass configured RPZ policies. (CVE-2026-11331)
It was discovered that Bind performed unnecessary vali
Red Hat
bind9: bind: Potential wildcard CNAME RPZ policy bypass
vendor_redhat·2026-07-22·CVSS 7.5
CVE-2026-11331 [HIGH] bind9: bind: Potential wildcard CNAME RPZ policy bypass
bind9: bind: 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.
Package: bind (Red Hat Enterprise Linux 10) - Affected
Package: bind (Red Hat Enterprise Linux 6) - Affected
Package: bind (Red Hat Enterprise Linux 7) - Affected
Package: bind (Red Hat Enterprise Linux 8) - Affected
Package: bind9.16 (Red Hat Ent
GHSA
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.
ghsa_unreviewed·2026-07-22
CVE-2026-11331 [HIGH] CWE-790 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.
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-11331 bind: Potential wildcard CNAME RPZ policy bypass [fedora-all]
bugzilla·2026-08-26·CVSS 7.5
CVE-2026-11331 [HIGH] CVE-2026-11331 bind: Potential wildcard CNAME RPZ policy bypass [fedora-all]
CVE-2026-11331 bind: Potential wildcard CNAME RPZ policy bypass [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-11331 dhcp: Potential wildcard CNAME RPZ policy bypass [fedora-all]
bugzilla·2026-08-26·CVSS 7.5
CVE-2026-11331 [HIGH] CVE-2026-11331 dhcp: Potential wildcard CNAME RPZ policy bypass [fedora-all]
CVE-2026-11331 dhcp: Potential wildcard CNAME RPZ policy bypass [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-11331 bind9: bind: Potential wildcard CNAME RPZ policy bypass
bugzilla·2026-07-21·CVSS 7.5
CVE-2026-11331 [HIGH] CVE-2026-11331 bind9: bind: Potential wildcard CNAME RPZ policy bypass
CVE-2026-11331 bind9: bind: 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.
2026-07-22
Published