CVE-2026-81563
Fixed in a distro release EPSS <1%CVSS 7.5
A BIND resolver encountering an SVCB/HTTPS AliasMode record referencing 14 or more SVCB/HTTPS ServiceMode records may fail to properly deallocate internal resources. If this happens repeatedly, resource exhaustion will eventually prevent the resolver from performing new recursive lookups. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Products: ISC BIND 9
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 10 | bind | 32:9.18.33-15.el10_2.12 |
| AlmaLinux 10 | bind-chroot | 32:9.18.33-15.el10_2.12 |
| AlmaLinux 10 | bind-devel | 32:9.18.33-15.el10_2.12 |
| AlmaLinux 10 | bind-dnssec-utils | 32:9.18.33-15.el10_2.12 |
| AlmaLinux 10 | bind-doc | 32:9.18.33-15.el10_2.12 |
| AlmaLinux 10 | bind-libs | 32:9.18.33-15.el10_2.12 |
| AlmaLinux 10 | bind-license | 32:9.18.33-15.el10_2.12 |
| AlmaLinux 10 | bind-utils | 32:9.18.33-15.el10_2.12 |
| AlmaLinux 9 | bind9.18 | 32:9.18.29-14.el9_8.10 |
| AlmaLinux 9 | bind9.18-chroot | 32:9.18.29-14.el9_8.10 |
| AlmaLinux 9 | bind9.18-devel | 32:9.18.29-14.el9_8.10 |
| AlmaLinux 9 | bind9.18-dnssec-utils | 32:9.18.29-14.el9_8.10 |
| AlmaLinux 9 | bind9.18-doc | 32:9.18.29-14.el9_8.10 |
| AlmaLinux 9 | bind9.18-libs | 32:9.18.29-14.el9_8.10 |
| AlmaLinux 9 | bind9.18-utils | 32:9.18.29-14.el9_8.10 |
| Alpine 3.22 | bind | 9.20.29-r0 |
| Alpine 3.23 | bind | 9.20.29-r0 |
| Alpine 3.24 | bind | 9.20.29-r0 |
| Chainguard | bind | 9.20.30-r0 |
| Chainguard | bind-dev | 9.20.30-r0 |
| Chainguard | bind-dnssec-root | 9.20.30-r0 |
| Chainguard | bind-dnssec-tools | 9.20.29-r1 |
| Chainguard | bind-dnssec-tools | 9.20.30-r0 |
| Chainguard | bind-libs | no fix |
| Chainguard | bind-plugins | 9.20.30-r0 |
| Chainguard | bind-plugins | 9.20.29-r1 |
| Chainguard | bind-tools | no fix |
| Chainguard | bind-tools | 9.20.30-r0 |
| Debian 12 | bind9 | no fix |
| Debian 13 | bind9 | 1:9.20.29-1~deb13u1 |
| Debian 14 | bind9 | 1:9.20.29-1 |
| Red Hat Enterprise Linux 10.2 | bind | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-chroot | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-debuginfo | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-debugsource | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-devel | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-dnssec-utils | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-dnssec-utils-debuginfo | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-doc | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-libs | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-libs-debuginfo | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-license | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-utils | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 10.2 | bind-utils-debuginfo | 32:9.18.33-15.el10_2.12 |
| Red Hat Enterprise Linux 9 | bind9.18 | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-chroot | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-debuginfo | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-debugsource | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-devel | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-dnssec-utils | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-dnssec-utils-debuginfo | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-doc | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-libs | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-libs-debuginfo | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-utils | 32:9.18.29-14.el9_8.10 |
| Red Hat Enterprise Linux 9 | bind9.18-utils-debuginfo | 32:9.18.29-14.el9_8.10 |
| Red Hat hummingbird 1 | bind | 0:9.20.29-0.1.hum1 |
| Red Hat hummingbird 1 | bind-chroot | 0:9.20.29-0.1.hum1 |
| Red Hat hummingbird 1 | bind-devel | 0:9.20.29-0.1.hum1 |
| Red Hat hummingbird 1 | bind-dnssec-utils | 0:9.20.29-0.1.hum1 |
| Red Hat hummingbird 1 | bind-doc | 0:9.20.29-0.1.hum1 |
| Red Hat hummingbird 1 | bind-libs | 0:9.20.29-0.1.hum1 |
| Red Hat hummingbird 1 | bind-utils | 0:9.20.29-0.1.hum1 |
| Rocky Linux 10 | bind | 2:9.18.33-15.el10_2.12 |
| Rocky Linux 9 | bind9.18 | 2:9.18.29-14.el9_8.10 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | bind | 9.20.29-150700.3.32.2 |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | bind | 9.20.29-150700.3.32.2 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | bind | 9.18.50-150600.3.35.1 |
| SUSE Linux Enterprise Server 16.0 | bind | 9.20.29-160000.1.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | bind | 9.18.50-150600.3.35.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | bind | 9.20.29-160000.1.1 |
| Ubuntu 18.04 LTS | isc-dhcp | no fix |
| Ubuntu 20.04 LTS | bind9-libs | no fix |
| Ubuntu 22.04 LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.7 |
| Ubuntu 22.04 LTS | bind9-libs | no fix |
| Ubuntu 24.04 LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.8 |
| Ubuntu 24.04 LTS | isc-dhcp | no fix |
| Ubuntu 26.04 LTS | bind9 | 1:9.20.24-1ubuntu0.4 |
| Ubuntu 26.04 LTS | isc-dhcp | no fix |
| Ubuntu 26.10 | bind9 | no fix |
| Ubuntu Pro 14.04 LTS | bind9 | 1:9.9.5.dfsg-3ubuntu0.19+esm15 |
| Ubuntu Pro 16.04 LTS | bind9 | 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11 |
| Ubuntu Pro 18.04 LTS | bind9 | 1:9.11.3+dfsg-1ubuntu1.19+esm6 |
| Ubuntu Pro 20.04 LTS | bind9 | 1:9.18.30-0ubuntu0.20.04.2+esm3 |
| Wolfi | bind | 9.20.30-r0 |
| Wolfi | bind-dev | 9.20.30-r0 |
| Wolfi | bind-dnssec-root | 9.20.30-r0 |
| Wolfi | bind-dnssec-tools | 9.20.30-r0 |
| Wolfi | bind-dnssec-tools | 9.20.29-r1 |
| Wolfi | bind-libs | no fix |
| Wolfi | bind-plugins | 9.20.30-r0 |
| Wolfi | bind-plugins | 9.20.29-r1 |
| Wolfi | bind-tools | no fix |
| Wolfi | bind-tools | 9.20.30-r0 |
| openSUSE Leap 16.0 | bind | 9.20.29-160000.1.1 |
| openSUSE Tumbleweed | bind | 9.20.29-1.1 |