Description
In a BIND resolver, inbound DNS protocol messages with a particular structure will result in additional processing, with no limit imposed by BIND. A DNS message with a maliciously large number of such structures will cause BIND to consume disproportionate amounts of CPU time and memory during processing.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | BIND 9 | 9.11.0 – ≤ 9.18.50, 9.20.0 – ≤ 9.20.29, 9.21.0 – ≤ 9.21.26, 9.11.3-S1 – ≤ 9.18.50-S1, 9.20.9-S1 – ≤ 9.20.29-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 | 1:9.20.30-1 | — |
| Debian 13 | bind9 | 1:9.20.30-1~deb13u1 | — |
| Debian 12 | bind9 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | bind9 | 1:9.20.24-1ubuntu3.1 | USN-8969-1 |
| Ubuntu 26.04 LTS | bind9 | 1:9.20.24-1ubuntu0.5 | USN-8969-1 |
| Ubuntu 26.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 24.04 LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.9 | USN-8969-1 |
| Ubuntu 24.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 22.04 LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.8 | USN-8969-1 |
| 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 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | bind9 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | bind9 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | bind9 | No fix yet | — |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | bind +7 | 32:9.18.33-15.el10_2.14 | ALSA-2026:92419 |
| AlmaLinux 9 | bind +9 | 32:9.16.23-40.el9_8.13 | ALSA-2026:93610 |
| AlmaLinux 9 | bind9.18 +6 | 32:9.18.29-14.el9_8.12 | ALSA-2026:93072 |
| AlmaLinux 8 | bind +16 | 32:9.11.36-18.el8_10 | ALSA-2026:93925 |
| AlmaLinux 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10.21 | ALSA-2026:94011 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | bind | 2:9.18.33-15.el10_2.14 | RLSA-2026:92419 |
| Rocky Linux 9 | bind | 2:9.16.23-40.el9_8.13 | RLSA-2026:98497, RLSA-2026:93610 |
| Rocky Linux 9 | bind-doc +8 | 2:9.16.50-12.el9_9.1 | RLSA-2026:98497 |
| Rocky Linux 9 | bind9.18 | 2:9.18.29-14.el9_8.12 | RLSA-2026:98525, RLSA-2026:93072 |
| Rocky Linux 9 | bind9.18-doc +5 | 2:9.18.29-29.el9_9.1 | RLSA-2026:98525 |
| Rocky Linux 8 | bind | 2:9.11.36-18.el8_10 | RLSA-2026:93925 |
| Rocky Linux 8 | bind9.16 | 2:9.16.23-0.22.el8_10.21 | RLSA-2026:94011 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | bind | 9.20.30-1.1 | openSUSE-SU-2026:12231-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | bind | 9.20.30-r0 | — |
| Alpine v3.23 | bind | 9.20.30-r0 | — |
| Alpine v3.22 | bind | 9.20.30-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | bind +7 | 32:9.18.50-1.amzn2023.0.5 | ALAS2023-2026-3312 |
| Amazon Linux 2 | bind +15 | 32:9.11.4-26.P2.amzn2.13.20 | ALAS2-2026-4038 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | bind | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | bind +7 | 32:9.18.33-15.0.1.el10_2.14 | ELSA-2026-92419 |
| Oracle Linux 9 | bind +9 | 32:9.16.23-40.0.1.el9_8.13 | ELSA-2026-93610 |
| Oracle Linux 9 | bind9.18 +6 | 32:9.18.29-14.el9_8.12 | ELSA-2026-93072 |
| Oracle Linux 8 | bind +16 | 32:9.11.36-18.el8_10 | ELSA-2026-93925 |
| Oracle Linux 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10.21 | ELSA-2026-94011 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | bind +7 | No fix yet | — |
Advisories 22
- RLSA-2026:98525 Important: bind9.18 security update Rocky Linux Security Advisories · Nov 13, 2026
- RLSA-2026:98497 Important: bind security update Rocky Linux Security Advisories · Nov 13, 2026
- WID-SEC-2026-4116 Internet Systems Consortium BIND: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- USN-8969-1 bind9 vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- RLSA-2026:94011 Important: bind9.16 security update Rocky Linux Security Advisories · Nov 3, 2026
- RLSA-2026:93610 Important: bind security update Rocky Linux Security Advisories · Nov 3, 2026
- RLSA-2026:93925 Important: bind security, bug fix, and enhancement update Rocky Linux Security Advisories · Nov 3, 2026
- ALSA-2026:93925 Important: bind security, bug fix, and enhancement update AlmaLinux Security Advisories · Nov 3, 2026
- ALSA-2026:94011 Important: bind9.16 security update AlmaLinux Security Advisories · Nov 3, 2026
- ALSA-2026:93610 Important: bind security update AlmaLinux Security Advisories · Nov 2, 2026
- ELSA-2026-93610 Important: bind security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 2, 2026
- ELSA-2026-93925 Important: bind security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 2, 2026
- ELSA-2026-94011 Important: bind9.16 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 2, 2026
- RLSA-2026:93072 Important: bind9.18 security update Rocky Linux Security Advisories · Nov 1, 2026
- ALSA-2026:93072 Important: bind9.18 security update AlmaLinux Security Advisories · Oct 31, 2026
- ALSA-2026:92419 Important: bind security update AlmaLinux Security Advisories · Oct 30, 2026
- RLSA-2026:92419 Important: bind security update Rocky Linux Security Advisories · Oct 30, 2026
- ELSA-2026-93072 Important: bind9.18 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 30, 2026
- ELSA-2026-92419 Important: bind security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Oct 29, 2026
- ALAS2023-2026-3312 Important: bind security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- ALAS2-2026-4038 Important: bind security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- openSUSE-SU-2026:12231-1 bind-9.20.30-1.1 on GA media SUSE / openSUSE Security Updates · Oct 24, 2026
References
- CVE-2026-19630 vendor-advisory
- https://downloads.isc.org/isc/bind9/9.20.30 patch
- https://downloads.isc.org/isc/bind9/9.21.27 patch