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CVE-2026-12246— Out of bounds stack write with crafted APL RR

Quick assessment

Affected
NLnet Labs NSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NLnet Labs NSD是荷兰NLnet Labs组织的一款DNS服务器软件。 NLnet Labs NSD 4.14.0版本存在安全漏洞，该漏洞源于当区域写入磁盘时，特制的APL RR具有超出地址族允许范围的adflength将覆盖堆栈，最多可能写入111个攻击者控制的字节。

AI Predicted 7.8 Difficulty: Easy EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
NLnet Labs NSD 4.14.0< 4.14.3 affected
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I. Basic Information for CVE-2026-12246

Vulnerability Information
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Vulnerability Title
Out of bounds stack write with crafted APL RR
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
NLnet Labs NSD 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLnet Labs NSD是荷兰NLnet Labs组织的一款DNS服务器软件。 NLnet Labs NSD 4.14.0版本存在安全漏洞，该漏洞源于当区域写入磁盘时，特制的APL RR具有超出地址族允许范围的adflength将覆盖堆栈，最多可能写入111个攻击者控制的字节。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
NLnet Labs NSD 4.14.0 ~ 4.14.3 -

II. Public POCs for CVE-2026-12246

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III. Intelligence Information for CVE-2026-12246

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Vendor Advisories for CVE-2026-12246 (1)

Same Patch Batch · NLnet Labs · 2026-06-25 · 4 CVEs total

CVE-2026-12245 Denial of DNS over TLS service by any DoT client
CVE-2026-12490 Bypass of client certificate verification with transfer over TLS
CVE-2026-12244 Heap overflow and crash with crafted SVCB RR

IV. Related Vulnerabilities

Same product: NSD
Same vendor: NLnet Labs
Same weakness: CWE-120

V. Comments for CVE-2026-12246

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