Description
If a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache, a client can exhaust resolver CPU resources by sending a stream of SIG(0) signed requests.
This issue affects BIND 9 versions 9.0.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.49-S1, and 9.18.11-S1 through 9.18.27-S1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | BIND 9 | 9.0.0 – ≤ 9.11.37, 9.16.0 – ≤ 9.16.50, 9.18.0 – ≤ 9.18.27, 9.19.0 – ≤ 9.19.24, 9.9.3-S1 – ≤ 9.11.37-S1, 9.16.8-S1 – ≤ 9.16.49-S1, 9.18.11-S1 – ≤ 9.18.27-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 | 1:9.20.0-1 | — |
| Debian 13 | bind9 | 1:9.20.0-1 | — |
| Debian 12 | bind9 | 1:9.18.28-1~deb12u1 | DSA-5734-1 |
| Debian 11 | bind9 | 1:9.16.50-1~deb11u1 | DSA-5734-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 25.10 | isc-dhcp | No fix yet | — |
| Ubuntu 24.04 LTS | bind9 | 1:9.18.28-0ubuntu0.24.04.1 | USN-6909-1 |
| Ubuntu 24.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 22.04 LTS | bind9 | 1:9.18.28-0ubuntu0.22.04.1 | USN-6909-1 |
| Ubuntu 22.04 LTS | bind9-libs | No fix yet | — |
| Ubuntu 20.04 LTS | bind9 | 1:9.18.28-0ubuntu0.20.04.1 | USN-6909-1 |
| Ubuntu 20.04 LTS | bind9-libs | No fix yet | — |
Show 4 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 18.04 LTS | bind9 | 1:9.11.3+dfsg-1ubuntu1.19+esm4 | USN-6909-2 |
| Ubuntu Pro 16.04 LTS | bind9 | 1:9.10.3.dfsg.P4-8ubuntu1.19+esm9 | USN-6909-3 |
| Ubuntu Pro 14.04 LTS | bind9 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bind +9 | 32:9.16.23-18.el9_4.6 | RHSA-2024:5231 |
| RHEL 9 | bind-dyndb-ldap | 11.9-10.el9_4 | RHSA-2024:5231 |
| RHEL 8 | bind +16 | 32:9.11.36-16.el8_10.2 | RHSA-2024:5524 |
| RHEL 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10 | RHSA-2024:5390 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | bind +9 | 32:9.16.23-11.el9_2.5 | RHSA-2024:5813 |
| RHEL 9.2 EUS | bind-dyndb-ldap | 11.9-8.el9_2.3 | RHSA-2024:5813 |
| RHEL 9.0 E4S | bind +7 | 32:9.16.23-1.el9_0.7 | RHSA-2024:5907 |
| RHEL 9.0 E4S | bind-dyndb-ldap | 11.9-7.el9_0.3 | RHSA-2024:5907 |
| RHEL 8.8 EUS | bind +16 | 32:9.11.36-8.el8_8.6 | RHSA-2024:5838 |
| RHEL 8.8 EUS | bind9.16 +8 | 32:9.16.23-0.14.el8_8.5 | RHSA-2024:5525 |
| RHEL 8.6 TUS | bind +16 | 32:9.11.36-3.el8_6.9 | RHSA-2024:5908 |
| RHEL 8.6 TUS | bind9.16 +4 | 32:9.16.23-0.7.el8_6.6 | RHSA-2024:5418 |
| RHEL 8.6 E4S | bind +16 | 32:9.11.36-3.el8_6.9 | RHSA-2024:5908 |
| RHEL 8.6 E4S | bind9.16 +4 | 32:9.16.23-0.7.el8_6.6 | RHSA-2024:5418 |
| RHEL 8.6 AUS | bind +16 | 32:9.11.36-3.el8_6.9 | RHSA-2024:5908 |
| RHEL 8.6 AUS | bind9.16 +4 | 32:9.16.23-0.7.el8_6.6 | RHSA-2024:5418 |
| RHEL 8.4 TUS | bind +16 | 32:9.11.26-4.el8_4.6 | RHSA-2024:5871 |
| RHEL 8.4 E4S | bind +16 | 32:9.11.26-4.el8_4.6 | RHSA-2024:5871 |
| RHEL 8.4 AUS | bind +16 | 32:9.11.26-4.el8_4.6 | RHSA-2024:5871 |
| RHEL 8.2 AUS | bind +16 | 32:9.11.13-6.el8_2.9 | RHSA-2024:5655 |
| RHEL 7.7 AUS | bind +15 | 32:9.11.4-9.P2.el7_7.7 | RHSA-2024:5894 |
| RHEL 7 ELS | bind +15 | 32:9.11.4-26.P2.el7_9.17 | RHSA-2024:5930 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | bind +9 | 32:9.16.23-18.el9_4.6 | ALSA-2024:5231 |
| AlmaLinux 9 | bind-dyndb-ldap | 11.9-10.el9_4.alma.1 | ALSA-2024:5231 |
| AlmaLinux 8 | bind +16 | 32:9.11.36-16.el8_10.2 | ALSA-2024:5524 |
| AlmaLinux 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10 | ALSA-2024:5390 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | bind | 2:9.16.23-18.el9_4.6 | RLSA-2024:5231 |
| Rocky Linux 9 | bind-dyndb-ldap | 11.9-10.el9_4 | RLSA-2024:5231 |
| Rocky Linux 8 | bind | 2:9.11.36-16.el8_10.2 | RLSA-2024:5524 |
| Rocky Linux 8 | bind9.16 | 2:9.16.23-0.22.el8_10 | RLSA-2024:5390 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | bind | 9.16.6-150300.22.47.1 | SUSE-SU-2024:2810-1, SUSE-SU-2024:2636-1 |
| SLES 15 SP5 | bind | 9.16.50-150500.8.21.1 | SUSE-SU-2024:2862-1 |
| SLES 15 SP4 | bind | 9.16.50-150400.5.43.1 | SUSE-SU-2024:2863-1 |
| SLES 15 SP3 | bind | 9.16.6-150300.22.47.1 | SUSE-SU-2024:2810-1 |
| SLES 15 SP2 | bind | 9.16.6-150000.12.77.1 | SUSE-SU-2024:2811-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | bind | 9.11.22-3.57.1 | SUSE-SU-2024:2868-1 |
| SLES for SAP 15 SP4 | bind | 9.16.50-150400.5.43.1 | SUSE-SU-2024:2863-1 |
| SLES for SAP 15 SP3 | bind | 9.16.6-150300.22.47.1 | SUSE-SU-2024:2810-1 |
| SLES for SAP 15 SP2 | bind | 9.16.6-150000.12.77.1 | SUSE-SU-2024:2811-1 |
| SLES for SAP 12 SP5 | bind | 9.11.22-3.57.1 | SUSE-SU-2024:2868-1 |
| SLE Micro 5.5 | bind | 9.16.50-150500.8.21.1 | SUSE-SU-2024:2862-1 |
| SLE HPC 15 SP4 | bind | 9.16.50-150400.5.43.1 | SUSE-SU-2024:2863-1 |
| SLE HPC 15 SP3 | bind | 9.16.6-150300.22.47.1 | SUSE-SU-2024:2810-1 |
| SLE HPC 15 SP2 | bind | 9.16.6-150000.12.77.1 | SUSE-SU-2024:2811-1 |
| SUSE Manager Server 4.3 | bind | 9.16.50-150400.5.43.1 | SUSE-SU-2024:2863-1 |
| SUSE Manager Proxy 4.3 | bind | 9.16.50-150400.5.43.1 | SUSE-SU-2024:2863-1 |
| SUSE Manager Client Tools for SLE Micro 5 | bind | 9.16.6-150000.12.77.1 | SUSE-SU-2024:2811-1 |
| SUSE Enterprise Storage 7.1 | bind | 9.16.6-150300.22.47.1 | SUSE-SU-2024:2810-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | bind | 9.20.0-1.1 | openSUSE-SU-2024:14217-1 |
| openSUSE Leap 15.6 | bind | 9.18.28-150600.3.3.1 | SUSE-SU-2024:2636-1 |
| openSUSE Leap 15.5 | bind | 9.16.50-150500.8.21.1 | SUSE-SU-2024:2862-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | bind | 9.18.28-r0 | — |
| Alpine v3.23 | bind | 9.18.28-r0 | — |
| Alpine v3.22 | bind | 9.18.28-r0 | — |
| Alpine v3.21 | bind | 9.18.28-r0 | — |
| Alpine v3.20 | bind | 9.18.31-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | bind | 9.18.31-r0 | — |
| Alpine v3.18 | bind | 9.18.31-r0 | — |
| Alpine v3.17 | bind | 9.18.31-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | bind +11 | 32:9.18.28-1.amzn2023.0.1 | ALAS2023-2024-680 |
| Amazon Linux 2 | bind +15 | 32:9.11.4-26.P2.amzn2.13.7 | ALAS2-2024-2616 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | bind | 9.20.0-1 | — |
| Azure Linux 2 (CBL-Mariner) | bind | 9.16.50-1 | — |
| Azure Linux 2 (CBL-Mariner) | dhcp | 4.4.3.P1-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | bind +9 | 32:9.16.23-18.0.1.el9_4.6 | ELSA-2024-5231 |
| Oracle Linux 9 | bind-dyndb-ldap | 11.9-10.el9_4 | ELSA-2024-5231 |
| Oracle Linux 8 | bind +16 | 32:9.11.36-16.el8_10.2 | ELSA-2024-5524 |
| Oracle Linux 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10 | ELSA-2024-5390 |
| Oracle Linux 7 | bind +15 | 32:9.11.4-26.0.1.P2.el7_9.16 | ELSA-2024-5930 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | bind | 9.18.28-r0 | — |
Advisories 39
- ALSA-2024:5231 Important: bind and bind-dyndb-ldap security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:5524 Important: bind security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:5390 Important: bind9.16 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:5930 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2024:5908 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2024:5907 Red Hat Security Advisory: bind and bind-dyndb-ldap security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2024:5871 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2024:5894 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2024:5838 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2024:5655 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2024:5813 Red Hat Security Advisory: bind and bind-dyndb-ldap security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2024:5525 Red Hat Security Advisory: bind9.16 security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2024:5524 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2024:5390 Red Hat Security Advisory: bind9.16 security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2024:5418 Red Hat Security Advisory: bind9.16 security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2024:5231 Red Hat Security Advisory: bind and bind-dyndb-ldap security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- USN-6909-3 bind9 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-6909-1 bind9 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-6909-2 bind9 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5734-1 bind9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:5231 Important: bind and bind-dyndb-ldap security update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2024:2636-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2810-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2862-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14217-1 bind-9.20.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2811-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2868-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1700 Internet Systems Consortium BIND: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Jan 6, 2026
- WID-SEC-2025-0225 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 1, 2025
- WID-SEC-2025-0794 Juniper Junos Space: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 4, 2025
- RLSA-2024:5390 Important: bind9.16 security update Rocky Linux Security Advisories · May 7, 2025
- RLSA-2024:5524 Important: bind security update Rocky Linux Security Advisories · May 7, 2025
- SUSE-SU-2024:2863-1 Security update for bind SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2024-5930 Important: bind security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 14, 2024
- ELSA-2024-5524 Important: bind security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 19, 2024
- ELSA-2024-5390 Important: bind9.16 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 14, 2024
- ALAS2-2024-2616 Important: bind security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 13, 2024
- ELSA-2024-5231 Important: bind and bind-dyndb-ldap security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 13, 2024
- ALAS2023-2024-680 Important: bind security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 6, 2024