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NSD NSDOut of bounds stack write with crafted APL RR

Risk 62
Severity
7.2
Input Validation
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Last updated 29 June 2026

1 / 2
Source: Ubuntu
First published (updated )
CVE-2026-12246

oss-secNSD 4.15.1 security lease

Several vulnerabilities were found in NSD. The overview of the vulnerabilities with a brief description is:

CVE-2026-18664 - severity: HIGH Wrong interpretation of ACL ranges

CVE-2026-18916 - severity: MEDIUM Remote TCP DoS by throttling the TCP receive window

CVE-2026-19401 - severity: HIGH Remote UDP DoS by sending multiple DNS Cookie options

CVE-2026-19538 - severity: HIGH Bypass of BLOCKED ACL items on proxy protocol port over TCP or TLS

The patches are tested to apply/work on 4.15.0.

Best regards, -- Willem, on behalf of the NSD team.

First published (updated )
https://seclists.org/oss-sec/2026/q3/605

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