{"id":"CVE-2026-12244","state":"PUBLISHED","title":"Heap overflow and crash with crafted SVCB RR","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","publishedAt":"2026-06-25T05:24:08.548Z","updatedAt":"2026-06-25T12:45:34.403Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"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","source":"NLnet Labs"},"assigner":"NLnet Labs","products":["NLnet Labs NSD"],"affected":[{"vendor":"NLnet Labs","product":"NSD","defaultStatus":"unaffected","versions":[{"version":"4.14.0","status":"affected","lessThan":"4.14.3","versionType":"semver"}]}],"references":["https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12244.txt"],"weaknesses":["CWE-190","CWE-122"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/12xxx/CVE-2026-12244.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-12244","state":"PUBLISHED","datePublished":"2026-06-25T05:24:08.548Z","dateUpdated":"2026-06-25T12:45:34.403Z","assignerShortName":"NLnet Labs","assignerOrgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","dateReserved":"2026-06-15T06:46:44.866Z"},"containers":{"cna":{"title":"Heap overflow and crash with crafted SVCB RR","descriptions":[{"lang":"en","value":"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"}],"affected":[{"vendor":"NLnet Labs","product":"NSD","defaultStatus":"unaffected","versions":[{"version":"4.14.0","status":"affected","lessThan":"4.14.3","versionType":"semver"}]}],"references":[{"url":"https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12244.txt","tags":["vendor-advisory"]}],"metrics":[{"scenarios":[{"lang":"en","value":"Processing of a zonefile containing a crafted SVCB. These can be provided by a trusted primary"}],"cvssV4_0":{"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"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-190","description":"CWE-190: Integer Overflow or Wraparound","lang":"en","type":"CWE"},{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"NLnet Labs","orgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","dateUpdated":"2026-06-25T05:24:08.548Z"},"solutions":[{"lang":"en","value":"This issue is fixed starting with version 4.14.3."}],"credits":[{"lang":"en","type":"finder","value":"Qifan Zhang from Palo Alto Networks"}],"timeline":[{"lang":"en","time":"2026-05-28T00:00:00.000Z","value":"Issue reported by Qifan Zhang"},{"lang":"en","time":"2026-06-12T00:00:00.000Z","value":"NLnet Labs shares patch"},{"lang":"en","time":"2026-06-15T00:00:00.000Z","value":"Qifan Zhang verifies patch"},{"lang":"en","time":"2026-06-25T00:00:00.000Z","value":"Fix released with version 4.14.3"}],"datePublic":"2026-06-25T00:00:00.000Z","x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-25T12:45:15.927329Z","id":"CVE-2026-12244","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-25T12:45:34.403Z"}}]}}}