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CVE-2026-12244

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:37ecf97ae28a03a2d9db57526758d57e850e11100b30725693a968f4804c962f
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d7933c8a7ba142705d7f98676158d41454ceb3b9e940797c4250a60e16792eec · sha256:0ef80124ecd7f378… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d7933c8a7ba142705d7f98676158d41454ceb3b9e940797c4250a60e16792eec · sha256:0ef80124ecd7f378… · /containers/cna/problemTypes/0/descriptions/1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"NSD","vendor":"NLnet Labs","versions":[{"lessThan":"4.14.3","status":"affected","version":"4.14.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d7933c8a7ba142705d7f98676158d41454ceb3b9e940797c4250a60e16792eec · sha256:0ef80124ecd7f378… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":8.7,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d7933c8a7ba142705d7f98676158d41454ceb3b9e940797c4250a60e16792eec · sha256:0ef80124ecd7f378… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d7933c8a7ba142705d7f98676158d41454ceb3b9e940797c4250a60e16792eec · sha256:0ef80124ecd7f378… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d7933c8a7ba142705d7f98676158d41454ceb3b9e940797c4250a60e16792eec · sha256:0ef80124ecd7f378… · /containers/cna/problemTypes/0/descriptions/1

Source references

1 source assertion
{"tags":["vendor-advisory"],"url":"https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12244.txt"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d7933c8a7ba142705d7f98676158d41454ceb3b9e940797c4250a60e16792eec · sha256:0ef80124ecd7f378… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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