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CVE-2026-12245— Denial of DNS over TLS service by any DoT client

AI Predicted 6.5 Difficulty: Easy EPSS 0.27% · P19
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I. Basic Information for CVE-2026-12245

Vulnerability Information
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Vulnerability Title
Denial of DNS over TLS service by any DoT client
Source: NVD (National Vulnerability Database)
Vulnerability Description
NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
NLnet LabsNSD 4.13.0 ~ 4.14.3 -

II. Public POCs for CVE-2026-12245

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III. Intelligence Information for CVE-2026-12245

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Patches & Fixes for CVE-2026-12245 (1)

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

CVE-2026-12246Out of bounds stack write with crafted APL RR
CVE-2026-12490Bypass of client certificate verification with transfer over TLS
CVE-2026-12244Heap overflow and crash with crafted SVCB RR

IV. Related Vulnerabilities

Same product: NSD
Same vendor: NLnet Labs
Same weakness: CWE-416

V. Comments for CVE-2026-12245

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