CVE-2026-13321
published 2026-07-22CVE-2026-13321: The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone. This issue affects BIND 9 versions…
PriorityP348high8.6CVSS 3.1
AVNACLPRNUINSCCNIHAN
EPSS
0.22%
12.9th percentile
The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-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 | 9.11.0 – 9.18.50 | — |
| isc | bind_9 | 9.11.3-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
nvdv3.18.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
vendor_redhat8.6HIGH
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
bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
vendor_redhat·2026-07-22·CVSS 8.6
CVE-2026-13321 [HIGH] bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.
Statement: An attacker controlling any DNSSEC-signed zone can craft NSEC records that span into victim zones, enabling cross-zone cache poisoning with authenticated denial-of-service responses (AD=1).
Mitigation: Upgrade to the patched release most closely related to your current version of BIND 9:
- 9.20.26
GHSA
The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.
ghsa_unreviewed·2026-07-22
CVE-2026-13321 [HIGH] CWE-346 The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.
The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-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-2026-13321 dhcp: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field [fedora-all]
bugzilla·2026-08-26·CVSS 8.6
CVE-2026-13321 [HIGH] CVE-2026-13321 dhcp: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field [fedora-all]
CVE-2026-13321 dhcp: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field [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.
The resolver accepts validly-signed NSEC records where the "Next
Domain Name" field points outside the signer's zone. An attacker
controlling ANY DNSSEC-signed zone can craft NSEC records spanning
into victim zones, enabling cross-zone cache poisoning with AD=1
(Authenticated Data flag set)
Bugzilla
CVE-2026-13321 bind: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field [fedora-all]
bugzilla·2026-08-26·CVSS 8.6
CVE-2026-13321 [HIGH] CVE-2026-13321 bind: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field [fedora-all]
CVE-2026-13321 bind: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field [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.
The resolver accepts validly-signed NSEC records where the "Next
Domain Name" field points outside the signer's zone. An attacker
controlling ANY DNSSEC-signed zone can craft NSEC records spanning
into victim zones, enabling cross-zone cache poisoning with AD=1
(Authenticated Data flag set)
Bugzilla
CVE-2026-13321 bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
bugzilla·2026-07-21·CVSS 8.6
CVE-2026-13321 [HIGH] CVE-2026-13321 bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
CVE-2026-13321 bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
The resolver accepts validly-signed NSEC records where the "Next
Domain Name" field points outside the signer's zone. An attacker
controlling ANY DNSSEC-signed zone can craft NSEC records spanning
into victim zones, enabling cross-zone cache poisoning with AD=1
(Authenticated Data flag set)
2026-07-22
Published