CVE-2026-19538

8.2 highEPSS 0.4%

High (8.2) in nlnetlabs nsd. EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

8.2 high

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
CWEs: CWE-290, CWE-672
Published: 2026-08-26
Modified: 2026-09-08
Record from: the NVD, synced 2026-10-19

Affected

nlnetlabs:nsd

References

https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txt

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