CVE-2026-50248
Fixed in a distro release EPSS <1%CVSS 6.5
In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname's A/AAAA record (no valid RRSIG required) becomes the zone's XFR primary and can replaces the entire zone/the resolver's entire response policy.
Products: NLnet Labs unbound
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.22 | unbound | 1.25.2-r0 |
| Alpine 3.23 | unbound | 1.25.2-r0 |
| Alpine 3.24 | unbound | 1.25.2-r0 |
| Amazon Linux 2023 | python3-unbound | 1.17.1-1.amzn2023.0.13 |
| Amazon Linux 2023 | unbound | 1.17.1-1.amzn2023.0.13 |
| Amazon Linux 2023 | unbound-anchor | 1.17.1-1.amzn2023.0.13 |
| Amazon Linux 2023 | unbound-devel | 1.17.1-1.amzn2023.0.13 |
| Amazon Linux 2023 | unbound-libs | 1.17.1-1.amzn2023.0.13 |
| Amazon Linux 2023 | unbound-utils | 1.17.1-1.amzn2023.0.13 |
| Debian 12 | unbound | no fix |
| Debian 13 | unbound | 1.26.1-0+deb13u1 |
| Debian 14 | unbound | 1.25.2-1 |
| Red Hat hummingbird 1 | python3-unbound | 0:1.25.2-0.1.hum1 |
| Red Hat hummingbird 1 | unbound | 0:1.25.2-0.1.hum1 |
| Red Hat hummingbird 1 | unbound-anchor | 0:1.25.2-0.1.hum1 |
| Red Hat hummingbird 1 | unbound-devel | 0:1.25.2-0.1.hum1 |
| Red Hat hummingbird 1 | unbound-dracut | 0:1.25.2-0.1.hum1 |
| Red Hat hummingbird 1 | unbound-libs | 0:1.25.2-0.1.hum1 |
| Red Hat hummingbird 1 | unbound-munin | 0:1.25.2-0.1.hum1 |
| Red Hat hummingbird 1 | unbound-utils | 0:1.25.2-0.1.hum1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | unbound | 1.25.2-150100.10.28.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | unbound | 1.25.2-150100.10.28.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | unbound | 1.25.2-150100.10.28.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | unbound | 1.25.2-150100.10.28.1 |
| SUSE Linux Enterprise Micro 5.5 | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise Micro 5.5 | unbound | 1.25.2-150100.10.28.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | unbound | 1.26.1-150600.23.24.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | unbound | 1.25.2-150600.23.19.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | unbound | 1.25.2-150600.23.19.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | unbound | 1.26.1-150600.23.24.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | unbound | 1.25.2-150100.10.28.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | unbound | 1.25.2-150100.10.28.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | unbound | 1.26.1-150600.23.24.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | unbound | 1.25.2-150600.23.19.1 |
| SUSE Linux Enterprise Server 16.0 | unbound | 1.25.2-160000.1.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | unbound | 1.25.2-150100.10.28.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | unbound | 1.25.2-150100.10.28.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | unbound | 1.25.2-150600.23.19.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | unbound | 1.26.1-150600.23.24.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | unbound | 1.25.2-160000.1.1 |
| SUSE Linux Micro 6.0 | unbound | 1.26.1-159998.1.1 |
| SUSE Linux Micro 6.0 | unbound | 1.25.2-1.1 |
| SUSE Linux Micro 6.1 | unbound | 1.25.2-slfo.1.1_1.1 |
| SUSE Linux Micro 6.2 | unbound | 1.25.2-160000.1.1 |
| Ubuntu 22.04 LTS | unbound | no fix |
| Ubuntu 24.04 LTS | unbound | no fix |
| Ubuntu 26.04 LTS | unbound | no fix |
| Ubuntu 26.10 | unbound | no fix |
| Ubuntu Pro 14.04 LTS | unbound | no fix |
| Ubuntu Pro 16.04 LTS | unbound | no fix |
| Ubuntu Pro 18.04 LTS | unbound | no fix |
| Ubuntu Pro 20.04 LTS | unbound | no fix |
| openSUSE Leap 16.0 | unbound | 1.25.2-160000.1.1 |
| openSUSE Tumbleweed | unbound | 1.25.2-1.1 |