CVE-2026-14586
Fixed in a distro release EPSS <1%CVSS 5.9
In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, in DNS-over-QUIC environments, with high concurrency and under pressure, an assertion in libngtcp2 about monotonic timestamps could trigger and result in server termination and thus denial of service. When interfacing with libngtcp2, for DNS-over-QUIC support in Unbound, it is expected to use monotonic time. Unbound was using realtime instead, and in DoQ environments with high concurrency and under pressure, an assert in libngtcp2 for the quic timestamp would trigger and terminate the server.This vulnerability needs Unbound to be compiled with DoQ support ('--with-libngtcp2') and the 'quic-port' to be configured for the listening interfaces.
Products: NLnet Labs unbound
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| 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 Server 16.0 | unbound | 1.25.2-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | unbound | 1.25.2-160000.1.1 |
| 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 |