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CVE-2026-12244

HIGH
8.7
CVSS 4.0
Description
If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an (uint16_t) variable that is used to allocate space needed for the RR wrap (because total size > 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes

Metadata

CVE ID
CVE-2026-12244
State
PUBLISHED
Assigner
NLnet Labs
Reserved
2026-06-15 06:46 UTC
Published
2026-06-25 05:24 UTC
Last updated
2026-06-25 05:24 UTC
Primary CWE
CWE-190
CWE-190: Integer Overflow or Wraparound
Vendor / Product
NLnet Labs / NSD
Sources
cve.org  ·  NVD

Severity & Metrics

8.7 HIGH CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products (1)
VendorProductPlatformVersions
NLnet Labs NSD — 4.14.0 < 4.14.3
Weakness (CWE)
CWESourceDescription
CWE-122 cna CWE-122: Heap-based Buffer Overflow
CWE-190 cna CWE-190: Integer Overflow or Wraparound
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.7 HIGH 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References (1)
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