CVE-2026-97206
Fixed in a distro release EPSS <1%CVSS 7.5
NLnet Labs Unbound, 1.22.0 up to and including version 1.26.1, contains a DNS-over-QUIC (DoQ) lifetime bug reachable by a remote DoQ client under multi-threaded operation. A client-triggered QUIC path migration can enter stream/connection cleanup while a mesh reply still retains a pointer to the DoQ stream. Cleanup frees the DoQ stream and when the pending mesh reply later completes it dereferences a stale pointer leading to a crash.
Products: NLnet Labs unbound
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | unbound | no fix |
| Debian 13 | unbound | 1.26.2-0+deb13u1 |
| Debian 14 | unbound | 1.26.2-1 |
| 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 Tumbleweed | unbound | 1.26.2-1.1 |