CVE-2026-11721

EUVD-2026-47709

22.07.2026, 15:16

It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes `named` to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to have any effect, the resolver under attack must have set `synth-from-dnssec yes;` (which is the default).
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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Awaiting analysis

This vulnerability is currently awaiting analysis.

Base Score

CVSS 3.x

EPSS Score

Percentile: 32.74%

Debian Releases

Debian Product

Codename

bind9

bookworm	vulnerable
bookworm (security)	1:9.18.49-1~deb12u2 fixed
forky	1:9.20.27-1 fixed
sid	1:9.20.27-2 fixed
trixie	vulnerable
trixie (security)	1:9.20.26-1~deb13u1 fixed

Ubuntu Releases

Ubuntu Product

Codename

bind9

bionic	needs-triage
focal	needs-triage
jammy	Fixed 1:9.18.39-0ubuntu0.22.04.5 released
noble	Fixed 1:9.18.39-0ubuntu0.24.04.6 released
resolute	Fixed 1:9.20.24-1ubuntu0.2 released
trusty	needs-triage
xenial	needs-triage

isc-dhcp

bionic	needs-triage
focal	not-affected
jammy	not-affected
noble	needs-triage
resolute	needs-triage
trusty	not-affected
xenial	not-affected

bind9-libs

focal	needs-triage
jammy	needs-triage
noble	dne
resolute	dne

openSUSE / SLES Releases

openSUSE Product

Release

bind

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise sap 15 SP4	9.16.50-150400.5.65.1 fixed
suse enterprise sap 15 SP5	9.16.50-150500.8.41.1 fixed
suse enterprise sap 15 SP6	9.18.50-150600.3.32.1 fixed
suse enterprise sap 15 SP7	9.20.26-150700.3.29.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 15 SP4	9.16.50-150400.5.65.1 fixed
suse enterprise server 15 SP5	9.16.50-150500.8.41.1 fixed
suse enterprise server 15 SP6	9.18.50-150600.3.32.1 fixed
suse enterprise server 15 SP7	9.20.26-150700.3.29.1 fixed

bind-chrootenv

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

bind-devel

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

bind-doc

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise sap 15 SP4	9.16.50-150400.5.65.1 fixed
suse enterprise sap 15 SP5	9.16.50-150500.8.41.1 fixed
suse enterprise sap 15 SP6	9.18.50-150600.3.32.1 fixed
suse enterprise sap 15 SP7	9.20.26-150700.3.29.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 15 SP4	9.16.50-150400.5.65.1 fixed
suse enterprise server 15 SP5	9.16.50-150500.8.41.1 fixed
suse enterprise server 15 SP6	9.18.50-150600.3.32.1 fixed
suse enterprise server 15 SP7	9.20.26-150700.3.29.1 fixed

bind-utils

suse enterprise desktop 15 SP7	9.20.26-150700.3.29.1 fixed
suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise sap 15 SP4	9.16.50-150400.5.65.1 fixed
suse enterprise sap 15 SP5	9.16.50-150500.8.41.1 fixed
suse enterprise sap 15 SP6	9.18.50-150600.3.32.1 fixed
suse enterprise sap 15 SP7	9.20.26-150700.3.29.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 15 SP4	9.16.50-150400.5.65.1 fixed
suse enterprise server 15 SP5	9.16.50-150500.8.41.1 fixed
suse enterprise server 15 SP6	9.18.50-150600.3.32.1 fixed
suse enterprise server 15 SP7	9.20.26-150700.3.29.1 fixed

libbind9-161

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

libdns1110

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

libdns1605

suse enterprise desktop 15 SP7	9.16.6-150300.22.62.1 fixed
suse enterprise sap 15 SP6	9.16.6-150300.22.62.1 fixed
suse enterprise sap 15 SP7	9.16.6-150300.22.62.1 fixed
suse enterprise server 15 SP6	9.16.6-150300.22.62.1 fixed
suse enterprise server 15 SP7	9.16.6-150300.22.62.1 fixed

libirs-devel

suse enterprise desktop 15 SP7	9.16.6-150300.22.62.1 fixed
suse enterprise sap 15 SP6	9.16.6-150300.22.62.1 fixed
suse enterprise sap 15 SP7	9.16.6-150300.22.62.1 fixed
suse enterprise server 15 SP6	9.16.6-150300.22.62.1 fixed
suse enterprise server 15 SP7	9.16.6-150300.22.62.1 fixed

libirs1601

suse enterprise desktop 15 SP7	9.16.6-150300.22.62.1 fixed
suse enterprise sap 15 SP6	9.16.6-150300.22.62.1 fixed
suse enterprise sap 15 SP7	9.16.6-150300.22.62.1 fixed
suse enterprise server 15 SP6	9.16.6-150300.22.62.1 fixed
suse enterprise server 15 SP7	9.16.6-150300.22.62.1 fixed

libirs161

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

libisc1107

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

libisc1107-32bit

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

libisc1606

suse enterprise desktop 15 SP7	9.16.6-150300.22.62.1 fixed
suse enterprise sap 15 SP6	9.16.6-150300.22.62.1 fixed
suse enterprise sap 15 SP7	9.16.6-150300.22.62.1 fixed
suse enterprise server 15 SP6	9.16.6-150300.22.62.1 fixed
suse enterprise server 15 SP7	9.16.6-150300.22.62.1 fixed

libisccc161

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

libisccfg1600

suse enterprise desktop 15 SP7	9.16.6-150300.22.62.1 fixed
suse enterprise sap 15 SP6	9.16.6-150300.22.62.1 fixed
suse enterprise sap 15 SP7	9.16.6-150300.22.62.1 fixed
suse enterprise server 15 SP6	9.16.6-150300.22.62.1 fixed
suse enterprise server 15 SP7	9.16.6-150300.22.62.1 fixed

libisccfg163

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

liblwres161

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

python-bind

suse enterprise sap 12 SP5	9.11.22-3.74.1 fixed
suse enterprise server 12 SP5	9.11.22-3.74.1 fixed

python3-bind

suse enterprise sap 15 SP4	9.16.50-150400.5.65.1 fixed
suse enterprise sap 15 SP5	9.16.50-150500.8.41.1 fixed
suse enterprise server 15 SP4	9.16.50-150400.5.65.1 fixed
suse enterprise server 15 SP5	9.16.50-150500.8.41.1 fixed

Red Hat Enterprise Linux Releases

Red Hat Product

Release

bind

RHEL 8	32:9.11.36-16.el8_10.14 fixed
RHEL 9	32:9.16.23-40.el9_8.8 fixed

bind-chroot

RHEL 8	32:9.11.36-16.el8_10.14 fixed
RHEL 9	32:9.16.23-40.el9_8.8 fixed

bind-devel

RHEL 8	32:9.11.36-16.el8_10.14 fixed
RHEL 9	32:9.16.23-40.el9_8.8 fixed

bind-dnssec-doc

RHEL 9

32:9.16.23-40.el9_8.8

fixed

bind-dnssec-utils

RHEL 9

32:9.16.23-40.el9_8.8

fixed

bind-doc

RHEL 9

32:9.16.23-40.el9_8.8

fixed

bind-export-devel

RHEL 8

32:9.11.36-16.el8_10.14

fixed

bind-export-libs

RHEL 8

32:9.11.36-16.el8_10.14

fixed

bind-libs

RHEL 8	32:9.11.36-16.el8_10.14 fixed
RHEL 9	32:9.16.23-40.el9_8.8 fixed

bind-libs-lite

RHEL 8

32:9.11.36-16.el8_10.14

fixed

bind-license

RHEL 8	32:9.11.36-16.el8_10.14 fixed
RHEL 9	32:9.16.23-40.el9_8.8 fixed

bind-lite-devel

RHEL 8

32:9.11.36-16.el8_10.14

fixed

bind-pkcs11

RHEL 8

32:9.11.36-16.el8_10.14

fixed

bind-pkcs11-devel

RHEL 8

32:9.11.36-16.el8_10.14

fixed

bind-pkcs11-libs

RHEL 8

32:9.11.36-16.el8_10.14

fixed

bind-pkcs11-utils

RHEL 8

32:9.11.36-16.el8_10.14

fixed

bind-sdb

RHEL 8

32:9.11.36-16.el8_10.14

fixed

bind-sdb-chroot

RHEL 8

32:9.11.36-16.el8_10.14

fixed

bind-utils

RHEL 8	32:9.11.36-16.el8_10.14 fixed
RHEL 9	32:9.16.23-40.el9_8.8 fixed

bind9.16

RHEL 8

32:9.16.23-0.22.el8_10.12

fixed

bind9.16-chroot

RHEL 8

32:9.16.23-0.22.el8_10.12

fixed

bind9.16-devel

RHEL 8

32:9.16.23-0.22.el8_10.12

fixed

bind9.16-dnssec-utils

RHEL 8

32:9.16.23-0.22.el8_10.12

fixed

bind9.16-doc

RHEL 8

32:9.16.23-0.22.el8_10.12

fixed

bind9.16-libs

RHEL 8

32:9.16.23-0.22.el8_10.12

fixed

bind9.16-license

RHEL 8

32:9.16.23-0.22.el8_10.12

fixed

bind9.16-utils

RHEL 8

32:9.16.23-0.22.el8_10.12

fixed

bind9.18

RHEL 9

32:9.18.29-14.el9_8.8

fixed

bind9.18-chroot

RHEL 9

32:9.18.29-14.el9_8.8

fixed

bind9.18-devel

RHEL 9

32:9.18.29-14.el9_8.8

fixed

bind9.18-dnssec-utils

RHEL 9

32:9.18.29-14.el9_8.8

fixed

bind9.18-doc

RHEL 9

32:9.18.29-14.el9_8.8

fixed

bind9.18-libs

RHEL 9

32:9.18.29-14.el9_8.8

fixed

bind9.18-utils

RHEL 9

32:9.18.29-14.el9_8.8

fixed

python3-bind

RHEL 8	32:9.11.36-16.el8_10.14 fixed
RHEL 9	32:9.16.23-40.el9_8.8 fixed

python3-bind9.16

RHEL 8

32:9.16.23-0.22.el8_10.12

fixed

Amazon Linux Releases

Amazon Package

Release

bind

Amazon Linux 2	32:9.11.4-26.P2.amzn2.13.17 fixed
Amazon Linux 2023	32:9.18.50-1.amzn2023.0.2 fixed

bind-chroot

Amazon Linux 2	32:9.11.4-26.P2.amzn2.13.17 fixed
Amazon Linux 2023	32:9.18.50-1.amzn2023.0.2 fixed

bind-debuginfo

Amazon Linux 2	32:9.11.4-26.P2.amzn2.13.17 fixed
Amazon Linux 2023	32:9.18.50-1.amzn2023.0.2 fixed

bind-debugsource

Amazon Linux 2023

32:9.18.50-1.amzn2023.0.2

fixed

bind-devel

Amazon Linux 2	32:9.11.4-26.P2.amzn2.13.17 fixed
Amazon Linux 2023	32:9.18.50-1.amzn2023.0.2 fixed

bind-dnssec-utils

Amazon Linux 2023

32:9.18.50-1.amzn2023.0.2

fixed

bind-dnssec-utils-debuginfo

Amazon Linux 2023

32:9.18.50-1.amzn2023.0.2

fixed

bind-doc

Amazon Linux 2023

32:9.18.50-1.amzn2023.0.2

fixed

bind-export-devel

Amazon Linux 2

32:9.11.4-26.P2.amzn2.13.17

fixed

bind-export-libs

Amazon Linux 2

32:9.11.4-26.P2.amzn2.13.17

fixed

bind-libs

Amazon Linux 2	32:9.11.4-26.P2.amzn2.13.17 fixed
Amazon Linux 2023	32:9.18.50-1.amzn2023.0.2 fixed

bind-libs-debuginfo

Amazon Linux 2023

32:9.18.50-1.amzn2023.0.2

fixed

bind-libs-lite

Amazon Linux 2

32:9.11.4-26.P2.amzn2.13.17

fixed

bind-license

Amazon Linux 2	32:9.11.4-26.P2.amzn2.13.17 fixed
Amazon Linux 2023	32:9.18.50-1.amzn2023.0.2 fixed

bind-lite-devel

Amazon Linux 2

32:9.11.4-26.P2.amzn2.13.17

fixed

bind-pkcs11

Amazon Linux 2

32:9.11.4-26.P2.amzn2.13.17

fixed

bind-pkcs11-devel

Amazon Linux 2

32:9.11.4-26.P2.amzn2.13.17

fixed

bind-pkcs11-libs

Amazon Linux 2

32:9.11.4-26.P2.amzn2.13.17

fixed

bind-pkcs11-utils

Amazon Linux 2

32:9.11.4-26.P2.amzn2.13.17

fixed

bind-sdb

Amazon Linux 2

32:9.11.4-26.P2.amzn2.13.17

fixed

bind-sdb-chroot

Amazon Linux 2

32:9.11.4-26.P2.amzn2.13.17

fixed

bind-utils

Amazon Linux 2	32:9.11.4-26.P2.amzn2.13.17 fixed
Amazon Linux 2023	32:9.18.50-1.amzn2023.0.2 fixed

bind-utils-debuginfo

Amazon Linux 2023

32:9.18.50-1.amzn2023.0.2

fixed

Azure Linux Releases

Azure Package

Release

bind

Azure Linux 3.0

0:9.20.26-1.azl3

fixed

Common Weakness Enumeration

CWE-1284 - Improper Validation of Specified Quantity in Input
The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

References

https://downloads.isc.org/isc/bind9/9.20.26

https://downloads.isc.org/isc/bind9/9.21.24

https://kb.isc.org/docs/cve-2026-11721