Description
BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. If a victim resolver makes a query to a specially crafted zone, the resolver will consume disproportionate resources.
This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | BIND 9 | 9.11.0 – ≤ 9.16.50, 9.18.0 – ≤ 9.18.48, 9.20.0 – ≤ 9.20.22, 9.21.0 – ≤ 9.21.21, 9.11.3-S1 – ≤ 9.16.50-S1, 9.18.11-S1 – ≤ 9.18.48-S1, 9.20.9-S1 – ≤ 9.20.22-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 | 1:9.20.23-1 | — |
| Debian 13 | bind9 | 1:9.20.23-1~deb13u1 | — |
| Debian 12 | bind9 | 1:9.18.49-1~deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | bind9 | 1:9.20.18-1ubuntu2.1 | — |
| Ubuntu 26.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 25.10 | bind9 | 1:9.20.11-1ubuntu2.4 | — |
| Ubuntu 25.10 | isc-dhcp | No fix yet | — |
| Ubuntu 24.04 LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.5 | — |
| Ubuntu 24.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 22.04 LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.4 | — |
| Ubuntu 22.04 LTS | bind9-libs | No fix yet | — |
| Ubuntu 20.04 LTS | bind9-libs | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu Pro 20.04 LTS | bind9 | 1:9.18.30-0ubuntu0.20.04.2+esm2 | USN-8682-1 |
| Ubuntu Pro 18.04 LTS | bind9 | 1:9.11.3+dfsg-1ubuntu1.19+esm5 | USN-8682-1 |
| Ubuntu Pro 16.04 LTS | bind9 | 1:9.10.3.dfsg.P4-8ubuntu1.19+esm10 | USN-8682-1 |
| Ubuntu Pro 14.04 LTS | bind9 | 1:9.9.5.dfsg-3ubuntu0.19+esm14 | USN-8682-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | bind +6 | 9.18.49-1.hum1 | RHSA-2026:20334 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | bind +9 | 2:9.16.50-11.el9_9 | RLSA-2026:97586 |
| Rocky Linux 9 | bind9.18 +6 | 2:9.18.29-28.el9_9 | RLSA-2026:97585 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | bind | 9.16.6-150300.22.59.1 | SUSE-SU-2026:2779-1, SUSE-SU-2026:2673-1 |
| SLES 15 SP6 | bind | 9.16.6-150300.22.59.1 | SUSE-SU-2026:2779-1, SUSE-SU-2026:2676-1 |
| SLES 15 SP5 | bind | 9.16.50-150500.8.38.1 | SUSE-SU-2026:2616-1 |
| SLES 15 SP4 | bind | 9.16.50-150400.5.62.1 | SUSE-SU-2026:2617-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | bind | 9.20.23-160000.1.1 | SUSE-SU-2026:22198-1 |
| SLES for SAP 15 SP6 | bind | 9.16.6-150300.22.59.1 | SUSE-SU-2026:2779-1, SUSE-SU-2026:2676-1 |
| SLES for SAP 15 SP5 | bind | 9.16.50-150500.8.38.1 | SUSE-SU-2026:2616-1 |
| SLES for SAP 15 SP4 | bind | 9.16.50-150400.5.62.1 | SUSE-SU-2026:2617-1 |
| SLES 16.0 | bind | 9.20.23-160000.1.1 | SUSE-SU-2026:22198-1 |
| SLE Micro 5.5 | bind | 9.16.50-150500.8.38.1 | SUSE-SU-2026:2616-1 |
| SLE HPC 15 SP5 | bind | 9.16.50-150500.8.38.1 | SUSE-SU-2026:2616-1 |
| SLE HPC 15 SP4 | bind | 9.16.50-150400.5.62.1 | SUSE-SU-2026:2617-1 |
| 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 | 9.20.23-1.1 | openSUSE-SU-2026:10874-1 |
| openSUSE Leap 16.0 | bind | 9.20.23-160000.1.1 | openSUSE-SU-2026:21123-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | bind | 9.20.23-r0 | — |
| Alpine v3.23 | bind | 9.20.23-r0 | — |
| Alpine v3.22 | bind | 9.20.23-r0 | — |
| Alpine v3.21 | bind | 9.18.49-r0 | — |
| Alpine v3.20 | bind | 9.18.49-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | bind +7 | 32:9.18.49-1.amzn2023.0.1 | ALAS2023-2026-1755 |
| Amazon Linux 2 | bind +15 | 32:9.11.4-26.P2.amzn2.13.16 | ALAS2-2026-3353 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | bind | 9.20.23-1 | — |
Advisories 16
- RLSA-2026:97586 Moderate: bind security, bug fix, and enhancement update Rocky Linux Security Advisories · Nov 13, 2026
- RLSA-2026:97585 Moderate: bind9.18 security, bug fix, and enhancement update Rocky Linux Security Advisories · Nov 13, 2026
- WID-SEC-2026-1626 Internet Systems Consortium BIND: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
- RHSA-2026:20334 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 12, 2026
- USN-8682-1 bind9 vulnerabilities Ubuntu Security Notices (USN) · Aug 27, 2026
- SUSE-SU-2026:3517-1 Security update for bind SUSE / openSUSE Security Updates · Aug 7, 2026
- SUSE-SU-2026:2779-1 Security update for bind SUSE / openSUSE Security Updates · Jul 7, 2026
- SUSE-SU-2026:2673-1 Security update for bind SUSE / openSUSE Security Updates · Jul 3, 2026
- openSUSE-SU-2026:21123-1 Security update for bind SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:2676-1 Security update for bind SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:2617-1 Security update for bind SUSE / openSUSE Security Updates · Jun 25, 2026
- SUSE-SU-2026:2616-1 Security update for bind SUSE / openSUSE Security Updates · Jun 25, 2026
- SUSE-SU-2026:22198-1 Security update for bind SUSE / openSUSE Security Updates · Jun 24, 2026
- ALAS2-2026-3353 Moderate: bind security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 8, 2026
- openSUSE-SU-2026:10874-1 bind-9.20.23-1.1 on GA media SUSE / openSUSE Security Updates · May 29, 2026
- ALAS2023-2026-1755 Important: bind security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 26, 2026
References
- CVE-2026-3592 vendor-advisory
- https://downloads.isc.org/isc/bind9/9.18.49 patch
- https://downloads.isc.org/isc/bind9/9.20.23 patch
- https://downloads.isc.org/isc/bind9/9.21.22 patch