CVE-2026-12244
8.8 · HIGHOverview
CVE-2026-12244 is a high-severity vulnerability affecting nlnetlabs nsd. It was published on June 25, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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
Remediation
Check the references section for vendor advisories and patches from nlnetlabs. Update nsd to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| nlnetlabs | nsd | >= 4.14.0, < 4.14.3 | Affected |
Frequently Asked Questions
What is CVE-2026-12244?
CVE-2026-12244 is a high-severity vulnerability affecting nlnetlabs nsd. It was published on June 25, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).
How severe is CVE-2026-12244?
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-12244?
Check the references section for vendor advisories and patches from nlnetlabs. Update nsd to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-12244?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-12244 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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