synced 7 MIN AGO
01 Record

CVE-2026-13321

DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field

HighPUBLISHEDCNA: isc
CNA base score8.6 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
View raw JSON

02 Description

DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.20% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 10.6% of scored records. A rank, not a probability.
NVD base score
8.6 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
NVD analysis status
Undergoing Analysis. NVD last modified this record on 2026-10-24.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-07-22 14:16Z3 MO AGO
Last updated
2026-07-22 18:51Z3 MO AGO
Reserved
2026-06-25
Assigning CNA
isc
Record state
PUBLISHED
Severity
High (CVSS 8.6)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Weaknesses
  • CWE-346Origin Validation ErrorClass
  • CWE-345Insufficient Verification of Data AuthenticityClass
Data version
5.2
Document digest
d34d1888d4dc9c5891817caf0ee7bd59cbf9f7336c4da4da613255f633595122

05 Affected products

VendorProductVersionsPlatforms
ISCBIND 99.11.0 to 9.18.50, 9.20.0 to 9.20.24, 9.21.0 to 9.21.23, 9.11.3-S1 to 9.18.50-S1, 9.20.9-S1 to 9.20.24-S1—

06 References

07 Remediation

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.

08 Fixed in

AlmaLinux 8

  • bind
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-chroot
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-devel
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-export-devel
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-export-libs
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-libs
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-libs-lite
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-license
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-lite-devel
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-pkcs11
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-pkcs11-devel
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-pkcs11-libs
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-pkcs11-utils
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-sdb
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-sdb-chroot
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-utils
    Fixed in 32:9.11.36-16.el8_10.14
  • bind9.16
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-chroot
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-devel
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-dnssec-utils
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-doc
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-libs
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-license
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-utils
    Fixed in 32:9.16.23-0.22.el8_10.12
  • python3-bind
    Fixed in 32:9.11.36-16.el8_10.14
  • python3-bind9.16
    Fixed in 32:9.16.23-0.22.el8_10.12

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • bind
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-chroot
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-devel
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-dnssec-doc
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-dnssec-utils
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-doc
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-libs
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-license
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-utils
    Fixed in 32:9.16.23-40.el9_8.8
  • bind9.18
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-chroot
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-devel
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-dnssec-utils
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-doc
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-libs
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-utils
    Fixed in 32:9.18.29-14.el9_8.8
  • python3-bind
    Fixed in 32:9.16.23-40.el9_8.8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • bind
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-chroot
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-devel
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-dnssec-utils
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-doc
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-libs
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-license
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-utils
    Fixed in 32:9.18.33-15.el10_2.10

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • bind
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-chroot
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-devel
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-export-devel
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-export-libs
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-libs
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-libs-lite
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-license
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-lite-devel
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-pkcs11
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-pkcs11-devel
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-pkcs11-libs
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-pkcs11-utils
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-sdb
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-sdb-chroot
    Fixed in 32:9.11.36-16.el8_10.14
  • bind-utils
    Fixed in 32:9.11.36-16.el8_10.14
  • bind9.16
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-chroot
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-devel
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-dnssec-utils
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-doc
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-libs
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-license
    Fixed in 32:9.16.23-0.22.el8_10.12
  • bind9.16-utils
    Fixed in 32:9.16.23-0.22.el8_10.12
  • python3-bind
    Fixed in 32:9.11.36-16.el8_10.14
  • python3-bind9.16
    Fixed in 32:9.16.23-0.22.el8_10.12

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • bind
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-chroot
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-devel
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-dnssec-doc
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-dnssec-utils
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-doc
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-libs
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-license
    Fixed in 32:9.16.23-40.el9_8.8
  • bind-utils
    Fixed in 32:9.16.23-40.el9_8.8
  • bind9.18
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-chroot
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-devel
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-dnssec-utils
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-doc
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-libs
    Fixed in 32:9.18.29-14.el9_8.8
  • bind9.18-utils
    Fixed in 32:9.18.29-14.el9_8.8
  • python3-bind
    Fixed in 32:9.16.23-40.el9_8.8

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • bind
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-chroot
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-devel
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-dnssec-utils
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-doc
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-libs
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-license
    Fixed in 32:9.18.33-15.el10_2.10
  • bind-utils
    Fixed in 32:9.18.33-15.el10_2.10

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • bind9
    Fixed in 1:9.18.49-1~deb12u2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • bind9
    Fixed in 1:9.20.26-1~deb13u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • bind9
    Fixed in 1:9.20.26-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • isc-dhcp
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • bind9-libs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • bind9
    Fixed in 1:9.18.39-0ubuntu0.22.04.5
  • bind9-libs
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • bind9
    Fixed in 1:9.18.39-0ubuntu0.24.04.6
  • isc-dhcp
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • bind9
    Fixed in 1:9.20.24-1ubuntu0.2
  • isc-dhcp
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • bind9
    Fixed in 1:9.9.5.dfsg-3ubuntu0.19+esm15
    Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • bind9
    Fixed in 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11
    Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • bind9
    Fixed in 1:9.11.3+dfsg-1ubuntu1.19+esm6
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • bind9
    Fixed in 1:9.18.30-0ubuntu0.20.04.2+esm3
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.