Description
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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | BIND 9 | 9.16.0 – ≤ 9.18.50, 9.20.0 – ≤ 9.20.24, 9.21.0 – ≤ 9.21.23, 9.16.8-S1 – ≤ 9.18.50-S1, 9.20.9-S1 – ≤ 9.20.24-S1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | bind9 | 1:9.20.26-1 | — |
| Debian 13 | bind9 | 1:9.20.26-1~deb13u1 | — |
| Debian 12 | bind9 | 1:9.18.49-1~deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | bind9 | 1:9.20.24-1ubuntu0.2 | USN-8929-1, USN-8648-1 |
| Ubuntu 26.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 24.04 LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.6 | USN-8929-1, USN-8648-1 |
| Ubuntu 24.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 22.04 LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.5 | USN-8929-1, USN-8648-1 |
| Ubuntu 22.04 LTS | bind9-libs | No fix yet | — |
| Ubuntu 20.04 LTS | bind9-libs | No fix yet | — |
| Ubuntu 18.04 LTS | isc-dhcp | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | bind9 | 1:9.18.30-0ubuntu0.20.04.2+esm3 | USN-8929-1 |
| Ubuntu Pro 18.04 LTS | bind9 | 1:9.11.3+dfsg-1ubuntu1.19+esm6 | USN-8929-1 |
| Ubuntu Pro 16.04 LTS | bind9 | 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11 | USN-8929-1 |
| Ubuntu Pro 14.04 LTS | bind9 | 1:9.9.5.dfsg-3ubuntu0.19+esm15 | USN-8929-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | bind +7 | 32:9.18.33-15.el10_2.10 | RHSA-2026:55437 |
| RHEL 9 | bind +9 | 32:9.16.23-40.el9_8.8 | RHSA-2026:54510 |
| RHEL 9 | bind9.18 +6 | 32:9.18.29-14.el9_8.8 | RHSA-2026:55442 |
| RHEL 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10.12 | RHSA-2026:54509 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.6 EUS | bind +3 | 32:9.16.23-31.el9_6.4 | RHSA-2026:55441 |
| RHEL 9.4 E4S | bind +7 | 32:9.16.23-18.el9_4.12 | RHSA-2026:57189 |
| RHEL 8.8 TUS | bind9.16 +2 | 32:9.16.23-0.14.el8_8.9 | RHSA-2026:79160 |
| RHEL 8.8 E4S | bind9.16 +2 | 32:9.16.23-0.14.el8_8.9 | RHSA-2026:79160 |
| RHEL 8.6 EUS Long Life | bind9.16 +1 | 32:9.16.23-0.7.el8_6.11 | RHSA-2026:80501 |
| RHEL 8.6 AUS | bind9.16 +1 | 32:9.16.23-0.7.el8_6.11 | RHSA-2026:80501 |
| Red Hat Hardened Images 1 | bind +6 | 9.20.26-0.1.hum1 | RHSA-2026:54071 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | bind +7 | 32:9.18.33-15.el10_2.10 | ALSA-2026:55437 |
| AlmaLinux 9 | bind +9 | 32:9.16.23-40.el9_8.8 | ALSA-2026:54510 |
| AlmaLinux 9 | bind9.18 +6 | 32:9.18.29-14.el9_8.8 | ALSA-2026:55442 |
| AlmaLinux 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10.12 | ALSA-2026:54509 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | bind | 2:9.18.33-15.el10_2.10 | RLSA-2026:55437 |
| Rocky Linux 9 | bind | 2:9.16.23-40.el9_8.8 | RLSA-2026:54510 |
| Rocky Linux 9 | bind9.18 | 2:9.18.29-14.el9_8.8 | RLSA-2026:55442 |
| Rocky Linux 8 | bind9.16 | 2:9.16.23-0.22.el8_10.12 | RLSA-2026:54509 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | bind | 9.16.6-150300.22.62.1 | SUSE-SU-2026:3554-1, SUSE-SU-2026:3426-1 |
| SLES 15 SP6 | bind | 9.16.6-150300.22.62.1 | SUSE-SU-2026:3554-1, SUSE-SU-2026:3452-1 |
| SLES 15 SP5 | bind | 9.16.50-150500.8.41.1 | SUSE-SU-2026:3477-1 |
| SLES 15 SP4 | bind | 9.16.50-150400.5.65.1 | SUSE-SU-2026:3476-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | bind | 9.16.6-150300.22.62.1 | SUSE-SU-2026:3554-1, SUSE-SU-2026:3452-1 |
| SLES for SAP 15 SP5 | bind | 9.16.50-150500.8.41.1 | SUSE-SU-2026:3477-1 |
| SLES for SAP 15 SP4 | bind | 9.16.50-150400.5.65.1 | SUSE-SU-2026:3476-1 |
| SLE Micro 5.5 | bind | 9.16.50-150500.8.41.1 | SUSE-SU-2026:3477-1 |
| SLE HPC 15 SP5 | bind | 9.16.50-150500.8.41.1 | SUSE-SU-2026:3477-1 |
| SLE HPC 15 SP4 | bind | 9.16.50-150400.5.65.1 | SUSE-SU-2026:3476-1 |
| SUSE Multi Linux Manager Tools SLE-Micro-5 | bind | 9.16.6-150000.12.91.1 | SUSE-SU-2026:3517-1 |
| SUSE Manager Client Tools for SLE Micro 5 | bind | 9.16.6-150000.12.91.1 | SUSE-SU-2026:3517-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | bind | 9.20.26-1.1 | openSUSE-SU-2026:11375-1 |
| openSUSE Leap 16.0 | bind | 9.20.26-160000.1.1 | openSUSE-SU-2026:21489-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | bind | 9.20.26-r0 | — |
| Alpine v3.23 | bind | 9.20.26-r0 | — |
| Alpine v3.22 | bind | 9.20.26-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | bind +7 | 32:9.18.50-1.amzn2023.0.2 | ALAS2023-2026-2040 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | bind | 9.20.26-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | bind +7 | 32:9.18.33-15.0.1.el10_2.10 | ELSA-2026-55437 |
| Oracle Linux 9 | bind +9 | 32:9.16.23-40.0.1.el9_8.8 | ELSA-2026-54510 |
| Oracle Linux 9 | bind9.18 +6 | 32:9.18.29-14.el9_8.8 | ELSA-2026-55442 |
| Oracle Linux 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10.12 | ELSA-2026-54509 |
Advisories 34
- WID-SEC-2026-2484 Internet Systems Consortium BIND: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 5, 2026
- ALSA-2026:54510 Important: bind security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:55442 Important: bind9.18 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:55437 Important: bind security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:54509 Important: bind9.16 security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-8929-1 bind9 vulnerabilities Ubuntu Security Notices (USN) · Oct 17, 2026
- RHSA-2026:80501 Red Hat Security Advisory: bind9.16 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:79160 Red Hat Security Advisory: bind9.16 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:57189 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:55441 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:55442 Red Hat Security Advisory: bind9.18 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:55437 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:54510 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:54509 Red Hat Security Advisory: bind9.16 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:54071 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- WID-SEC-2026-3038 Meinberg LANTIME: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 26, 2026
- USN-8648-1 bind9 vulnerabilities Ubuntu Security Notices (USN) · Aug 19, 2026
- RLSA-2026:55442 Important: bind9.18 security update Rocky Linux Security Advisories · Aug 17, 2026
- RLSA-2026:55437 Important: bind security update Rocky Linux Security Advisories · Aug 17, 2026
- ELSA-2026-55442 Important: bind9.18 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 17, 2026
- ELSA-2026-55437 Important: bind security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Aug 17, 2026
- RLSA-2026:54510 Important: bind security update Rocky Linux Security Advisories · Aug 14, 2026
- RLSA-2026:54509 Important: bind9.16 security update Rocky Linux Security Advisories · Aug 14, 2026
- ELSA-2026-54510 Important: bind security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 13, 2026
- ELSA-2026-54509 Important: bind9.16 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 13, 2026
- SUSE-SU-2026:3554-1 Security update for bind SUSE / openSUSE Security Updates · Aug 12, 2026
- SUSE-SU-2026:3517-1 Security update for bind SUSE / openSUSE Security Updates · Aug 7, 2026
- SUSE-SU-2026:3477-1 Security update for bind SUSE / openSUSE Security Updates · Aug 4, 2026
- SUSE-SU-2026:3452-1 Security update for bind SUSE / openSUSE Security Updates · Aug 4, 2026
- SUSE-SU-2026:3476-1 Security update for bind SUSE / openSUSE Security Updates · Aug 4, 2026
- ALAS2023-2026-2040 Important: bind security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 4, 2026
- openSUSE-SU-2026:21489-1 Security update for bind SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:3426-1 Security update for bind SUSE / openSUSE Security Updates · Jul 31, 2026
- openSUSE-SU-2026:11375-1 bind-9.20.26-1.1 on GA media SUSE / openSUSE Security Updates · Jul 27, 2026
References
- CVE-2026-11331 vendor-advisory
- https://downloads.isc.org/isc/bind9/9.20.26 patch
- https://downloads.isc.org/isc/bind9/9.21.24 patch