nsd: The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypasse...
CVE-2026-19538 is fixed in nsd on 1 platform by DEBIAN-CVE-2026-19538 (version 4.15.1-1), released September 4, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nsd · Debian 14 | 4.15.1-1 | DEBIAN-CVE-2026-19538 | Sep 4, 2026 |
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