# CVE-2026-19538

## Summary

- **CVE ID:** CVE-2026-19538
- **Severity:** HIGH
- **CVSS Score:** 8.2 (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)
- **CWE:** CWE-290, CWE-672
- **Published:** Aug 26, 2026
- **Last Modified:** Aug 26, 2026

## Description

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.

## Affected Products

- NLnet Labs — NSD (4.8.0)

## References

- [CNA](https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txt)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._