Unrated severityNVD Advisory· Published Aug 26, 2026· Updated Aug 26, 2026
Bypass of BLOCKED ACL items on proxy protocol port over TCP or TLS
CVE-2026-19538
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.
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Affected products
1Patches
Vulnerability mechanics
References
1- www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txtmitrevendor-advisory
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