CVE•Published 2026-06-25•Modified 2026-06-26•1 article on news•5 live references•NVD data
CVE-2026-12244Nlnetlabs · Nsd
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
17
Exploit Prediction Scoring System · top 83% of all CVEs
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
Timeline
Published 2026-06-25
Modified 2026-06-26
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-12244Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Nlnetlabs Nsd"All exposed Nlnetlabs Nsd instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Nsd"HTTP body or banner mentions "Nsd" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-12244Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-12244Censys host search filtered to this CVE id.
grep.app
CVE-2026-12244Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-12244GitHub code search for direct mentions.
Google dork
"CVE-2026-12244" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.