Vulnerability DatabaseCVE-2026-19538
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CVE-2026-19538
Published:August 26, 2026
Updated:September 24, 2026
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 Packages
https://github.com/NLnetLabs/nsd.git (GITHUB):
Affected version(s) >=NSD_4_8_0_REL <NSD_4_15_1_REL
Fix Suggestion:
Update to version NSD_4_15_1_REL
Related Resources (2)
https://nvd.nist.gov/vuln/detail/CVE-2026-19538
https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txt
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CVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Operation on a Resource after Expiration or Release
CWE-672
Authentication Bypass by Spoofing
CWE-290
EPSS
Base Score:
0.30