CVE-2026-19538
Fixed in a distro release EPSS <1%CVSS 8.2
The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.
Products: NLnet Labs NSD
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | nsd | no fix |
| Debian 13 | nsd | no fix |
| Debian 14 | nsd | 4.15.1-1 |
| Ubuntu 26.10 | nsd | no fix |
| Ubuntu Pro 16.04 LTS | nsd | no fix |
| Ubuntu Pro 18.04 LTS | nsd | no fix |
| Ubuntu Pro 20.04 LTS | nsd | no fix |
| Ubuntu Pro 22.04 LTS | nsd | no fix |
| Ubuntu Pro 24.04 LTS | nsd | no fix |
| Ubuntu Pro 26.04 LTS | nsd | no fix |