Name: CVE-2026-12246: Buffer Copy without Checking Size of Input
Creator: Rapid7
Published: 2026-06-25T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-12246, CWE-120, CWE-20, CVSS 8.1, EPSS 0.00444

NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes.

CVSS Details

CVSS 4.0 Base Score: 7.2 (HIGH)
CVSS 4.0 Vector: (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)
CVSS 3.1 Base Score: 8.1
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alpine Linux	—	Upgrade nsd	Jun 26, 2026	Jun 25, 2026
Freebsd	—	Upgrade nsd	Jun 30, 2026	Jun 29, 2026
Ubuntu	—	Upgrade nsd3 (Ubuntu Pro)Upgrade nsd (Ubuntu Pro)	Jun 25, 2026	Jun 25, 2026

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CVSS Details

Covered by Rapid7

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