7.5highHigh
CVE-2026-19538
Nlnetlabs Nsd
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.
Exploitation status
- A vendor advisory or patch reference has been published.
What the metrics mean
- It is reachable over a network, without needing local access.
- For an attacker who can reach it, no special conditions are needed to exploit it.
- To exploit it, no account is needed.
- Beyond that, no action by a user is required.
Scoring
- CVSS
- 7.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N- CVSS v4
- 8.2
- Weakness
- CWE-290
- Assigned by
- sep@nlnetlabs.nl
Dates
- Published
- 2026-08-26
- Last modified
- 2026-09-08
- Sources
- NVD
Affected products
- Nlnetlabs Nsd4.8.0 - 4.15.1
As listed in the NVD configuration data. Not a statement about your estate.