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
Advisories
| Source | ID | Title |
|---|---|---|
Ubuntu USN |
USN-8474-1 | NSD vulnerabilities |
Fixes
Solution
This issue is fixed starting with version 4.14.3.
Workaround
No workaround given by the vendor.
References
| Link | Providers |
|---|---|
| https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12244.txt |
|
History
Thu, 25 Jun 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Nlnetlabs
Nlnetlabs nsd |
|
| Vendors & Products |
Nlnetlabs
Nlnetlabs nsd |
|
| Metrics |
ssvc
|
Thu, 25 Jun 2026 06:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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 | |
| Title | Heap overflow and crash with crafted SVCB RR | |
| Weaknesses | CWE-122 CWE-190 |
|
| References |
| |
| Metrics |
cvssV4_0
|
Projects
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Status: PUBLISHED
Assigner: NLnet Labs
Published:
Updated: 2026-06-25T12:45:34.403Z
Reserved: 2026-06-15T06:46:44.866Z
Link: CVE-2026-12244
Updated: 2026-06-25T12:45:30.211Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-06-25T13:15:03Z
Ubuntu USN