CVE-2026-81642
Fixed in a distro release EPSS <1%CVSS 9.1
In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.
Products: NLnet Labs unbound
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 10 | python3-unbound | 1.24.2-7.el10_2.6 |
| AlmaLinux 10 | unbound | 1.24.2-7.el10_2.6 |
| AlmaLinux 10 | unbound-anchor | 1.24.2-7.el10_2.6 |
| AlmaLinux 10 | unbound-devel | 1.24.2-7.el10_2.6 |
| AlmaLinux 10 | unbound-dracut | 1.24.2-7.el10_2.6 |
| AlmaLinux 10 | unbound-libs | 1.24.2-7.el10_2.6 |
| AlmaLinux 10 | unbound-utils | 1.24.2-7.el10_2.6 |
| AlmaLinux 8 | python3-unbound | 1.16.2-5.14.el8_10.4 |
| AlmaLinux 8 | unbound | 1.16.2-5.14.el8_10.4 |
| AlmaLinux 8 | unbound-devel | 1.16.2-5.14.el8_10.4 |
| AlmaLinux 8 | unbound-libs | 1.16.2-5.14.el8_10.4 |
| AlmaLinux 9 | python3-unbound | 1.24.2-3.el9_8.8 |
| AlmaLinux 9 | unbound | 1.24.2-3.el9_8.8 |
| AlmaLinux 9 | unbound-devel | 1.24.2-3.el9_8.8 |
| AlmaLinux 9 | unbound-dracut | 1.24.2-3.el9_8.8 |
| AlmaLinux 9 | unbound-libs | 1.24.2-3.el9_8.8 |
| Alpine 3.22 | unbound | 1.25.2-r0 |
| Alpine 3.23 | unbound | 1.25.2-r0 |
| Alpine 3.24 | unbound | 1.25.2-r2 |
| Amazon Linux 2 | python2-unbound | 1.7.3-15.amzn2.0.16 |
| Amazon Linux 2 | python3-unbound | 1.7.3-15.amzn2.0.16 |
| Amazon Linux 2 | unbound | 1.7.3-15.amzn2.0.16 |
| Amazon Linux 2 | unbound-devel | 1.7.3-15.amzn2.0.16 |
| Amazon Linux 2 | unbound-libs | 1.7.3-15.amzn2.0.16 |
| Amazon Linux 2023 | python3-unbound | 1.17.1-1.amzn2023.0.14 |
| Amazon Linux 2023 | unbound | 1.17.1-1.amzn2023.0.14 |
| Amazon Linux 2023 | unbound-anchor | 1.17.1-1.amzn2023.0.14 |
| Amazon Linux 2023 | unbound-devel | 1.17.1-1.amzn2023.0.14 |
| Amazon Linux 2023 | unbound-libs | 1.17.1-1.amzn2023.0.14 |
| Amazon Linux 2023 | unbound-utils | 1.17.1-1.amzn2023.0.14 |
| Debian 12 | unbound | no fix |
| Debian 13 | unbound | 1.26.1-0+deb13u1 |
| Debian 14 | unbound | 1.26.1-1 |
| Red Hat Enterprise Linux 10.2 | python3-unbound | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | python3-unbound-debuginfo | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound-anchor | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound-anchor-debuginfo | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound-debuginfo | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound-debugsource | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound-devel | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound-dracut | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound-libs | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound-libs-debuginfo | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound-utils | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 10.2 | unbound-utils-debuginfo | 0:1.24.2-7.el10_2.6 |
| Red Hat Enterprise Linux 8 | python3-unbound | 0:1.16.2-5.14.el8_10.4 |
| Red Hat Enterprise Linux 8 | python3-unbound-debuginfo | 0:1.16.2-5.14.el8_10.4 |
| Red Hat Enterprise Linux 8 | unbound | 0:1.16.2-5.14.el8_10.4 |
| Red Hat Enterprise Linux 8 | unbound-debuginfo | 0:1.16.2-5.14.el8_10.4 |
| Red Hat Enterprise Linux 8 | unbound-debugsource | 0:1.16.2-5.14.el8_10.4 |
| Red Hat Enterprise Linux 8 | unbound-devel | 0:1.16.2-5.14.el8_10.4 |
| Red Hat Enterprise Linux 8 | unbound-libs | 0:1.16.2-5.14.el8_10.4 |
| Red Hat Enterprise Linux 8 | unbound-libs-debuginfo | 0:1.16.2-5.14.el8_10.4 |
| Red Hat Enterprise Linux 9 | python3-unbound | 0:1.24.2-3.el9_8.8 |
| Red Hat Enterprise Linux 9 | python3-unbound-debuginfo | 0:1.24.2-3.el9_8.8 |
| Red Hat Enterprise Linux 9 | unbound | 0:1.24.2-3.el9_8.8 |
| Red Hat Enterprise Linux 9 | unbound-debuginfo | 0:1.24.2-3.el9_8.8 |
| Red Hat Enterprise Linux 9 | unbound-debugsource | 0:1.24.2-3.el9_8.8 |
| Red Hat Enterprise Linux 9 | unbound-devel | 0:1.24.2-3.el9_8.8 |
| Red Hat Enterprise Linux 9 | unbound-dracut | 0:1.24.2-3.el9_8.8 |
| Red Hat Enterprise Linux 9 | unbound-libs | 0:1.24.2-3.el9_8.8 |
| Red Hat Enterprise Linux 9 | unbound-libs-debuginfo | 0:1.24.2-3.el9_8.8 |
| Red Hat Enterprise Linux eus 10.0 | unbound | 0:1.20.0-18.el10_0.13 |
| Red Hat Enterprise Linux eus 10.0 | unbound-libs | 0:1.20.0-18.el10_0.13 |
| Red Hat hummingbird 1 | python3-unbound | 0:1.26.1-1.hum1 |
| Red Hat hummingbird 1 | unbound | 0:1.26.1-1.hum1 |
| Red Hat hummingbird 1 | unbound-anchor | 0:1.26.1-1.hum1 |
| Red Hat hummingbird 1 | unbound-devel | 0:1.26.1-1.hum1 |
| Red Hat hummingbird 1 | unbound-dracut | 0:1.26.1-1.hum1 |
| Red Hat hummingbird 1 | unbound-libs | 0:1.26.1-1.hum1 |
| Red Hat hummingbird 1 | unbound-munin | 0:1.26.1-1.hum1 |
| Red Hat hummingbird 1 | unbound-utils | 0:1.26.1-1.hum1 |
| Red Hat rhel aus 8.4 | unbound | 0:1.7.3-15.el8_4.4 |
| Red Hat rhel aus 8.4 | unbound-libs | 0:1.7.3-15.el8_4.4 |
| Red Hat rhel aus 8.6 | unbound | 0:1.7.3-17.el8_6.8 |
| Red Hat rhel aus 8.6 | unbound-libs | 0:1.7.3-17.el8_6.8 |
| Red Hat rhel e4s 8.8 | python3-unbound | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel e4s 8.8 | python3-unbound-debuginfo | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel e4s 8.8 | unbound | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel e4s 8.8 | unbound-debuginfo | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel e4s 8.8 | unbound-debugsource | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel e4s 8.8 | unbound-devel | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel e4s 8.8 | unbound-libs | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel e4s 8.8 | unbound-libs-debuginfo | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel e4s 9.2 | python3-unbound | 0:1.16.2-3.el9_2.6 |
| Red Hat rhel e4s 9.2 | python3-unbound-debuginfo | 0:1.16.2-3.el9_2.6 |
| Red Hat rhel e4s 9.2 | unbound | 0:1.16.2-3.el9_2.6 |
| Red Hat rhel e4s 9.2 | unbound-debuginfo | 0:1.16.2-3.el9_2.6 |
| Red Hat rhel e4s 9.2 | unbound-debugsource | 0:1.16.2-3.el9_2.6 |
| Red Hat rhel e4s 9.2 | unbound-libs | 0:1.16.2-3.el9_2.6 |
| Red Hat rhel e4s 9.2 | unbound-libs-debuginfo | 0:1.16.2-3.el9_2.6 |
| Red Hat rhel e4s 9.4 | python3-unbound | 0:1.16.2-8.el9_4.3 |
| Red Hat rhel e4s 9.4 | python3-unbound-debuginfo | 0:1.16.2-8.el9_4.3 |
| Red Hat rhel e4s 9.4 | unbound | 0:1.16.2-8.el9_4.3 |
| Red Hat rhel e4s 9.4 | unbound-debuginfo | 0:1.16.2-8.el9_4.3 |
| Red Hat rhel e4s 9.4 | unbound-debugsource | 0:1.16.2-8.el9_4.3 |
| Red Hat rhel e4s 9.4 | unbound-libs | 0:1.16.2-8.el9_4.3 |
| Red Hat rhel e4s 9.4 | unbound-libs-debuginfo | 0:1.16.2-8.el9_4.3 |
| Red Hat rhel els 7 | unbound | 0:1.6.6-5.el7_9.2 |
| Red Hat rhel els 7 | unbound-debuginfo | 0:1.6.6-5.el7_9.2 |
| Red Hat rhel els 7 | unbound-devel | 0:1.6.6-5.el7_9.2 |
| Red Hat rhel els 7 | unbound-libs | 0:1.6.6-5.el7_9.2 |
| Red Hat rhel els 7 | unbound-python | 0:1.6.6-5.el7_9.2 |
| Red Hat rhel eus 9.6 | unbound | 0:1.16.2-19.el9_6.2 |
| Red Hat rhel eus 9.6 | unbound-libs | 0:1.16.2-19.el9_6.2 |
| Red Hat rhel eus long life 8.4 | unbound | 0:1.7.3-15.el8_4.4 |
| Red Hat rhel eus long life 8.4 | unbound-libs | 0:1.7.3-15.el8_4.4 |
| Red Hat rhel eus long life 8.6 | unbound | 0:1.7.3-17.el8_6.8 |
| Red Hat rhel eus long life 8.6 | unbound-libs | 0:1.7.3-17.el8_6.8 |
| Red Hat rhel tus 8.8 | python3-unbound | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel tus 8.8 | python3-unbound-debuginfo | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel tus 8.8 | unbound | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel tus 8.8 | unbound-debuginfo | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel tus 8.8 | unbound-debugsource | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel tus 8.8 | unbound-devel | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel tus 8.8 | unbound-libs | 0:1.16.2-5.el8_8.6 |
| Red Hat rhel tus 8.8 | unbound-libs-debuginfo | 0:1.16.2-5.el8_8.6 |
| Rocky Linux 10 | unbound | 0:1.24.2-7.el10_2.6 |
| Rocky Linux 8 | unbound | 0:1.16.2-5.14.el8_10.4 |
| Rocky Linux 9 | unbound | 0:1.24.2-3.el9_8.8 |
| 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-LTSS | unbound | 1.26.1-150100.10.31.1 |
| 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 Micro 5.5 | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | unbound | 1.26.1-150600.23.24.1 |
| 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 | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | unbound | 1.26.1-150100.10.31.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | unbound | 1.26.1-150600.23.24.1 |
| SUSE Linux Enterprise Server 16.0 | unbound | 1.26.1-160000.1.1 |
| 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 SP5 | unbound | 1.26.1-150100.10.31.1 |
| 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 | 1.26.1-160000.1.1 |
| SUSE Linux Micro 6.0 | unbound | 1.26.1-159998.1.1 |
| SUSE Linux Micro 6.2 | unbound | 1.26.1-160000.1.1 |
| Ubuntu 22.04 LTS | unbound | 1.13.1-1ubuntu5.16 |
| Ubuntu 24.04 LTS | unbound | 1.19.2-1ubuntu3.10 |
| Ubuntu 26.04 LTS | unbound | 1.24.2-1ubuntu2.3 |
| Ubuntu 26.10 | unbound | no fix |
| Ubuntu Pro 14.04 LTS | unbound | 1.4.22-1ubuntu4.14.04.3+esm4 |
| Ubuntu Pro 16.04 LTS | unbound | 1.5.8-1ubuntu1.1+esm4 |
| Ubuntu Pro 18.04 LTS | unbound | 1.6.7-1ubuntu2.6+esm5 |
| Ubuntu Pro 20.04 LTS | unbound | 1.9.4-2ubuntu1.11+esm2 |
| openSUSE Leap 16.0 | unbound | 1.26.1-160000.1.1 |
| openSUSE Tumbleweed | unbound | 1.26.1-1.1 |