{"id":"CVE-2026-12245","state":"PUBLISHED","title":"Denial of DNS over TLS service by any DoT client","description":"NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.","publishedAt":"2026-06-25T05:24:18.620Z","updatedAt":"2026-06-25T12:42:50.104Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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":"4.13.0","status":"affected","lessThan":"4.14.3","versionType":"semver"}]}],"references":["https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12245.txt"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/12xxx/CVE-2026-12245.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-12245","state":"PUBLISHED","datePublished":"2026-06-25T05:24:18.620Z","dateUpdated":"2026-06-25T12:42:50.104Z","assignerShortName":"NLnet Labs","assignerOrgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","dateReserved":"2026-06-15T06:47:18.496Z"},"containers":{"cna":{"title":"Denial of DNS over TLS service by any DoT client","descriptions":[{"lang":"en","value":"NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response."}],"affected":[{"vendor":"NLnet Labs","product":"NSD","defaultStatus":"unaffected","versions":[{"version":"4.13.0","status":"affected","lessThan":"4.14.3","versionType":"semver"}]}],"references":[{"url":"https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12245.txt","tags":["vendor-advisory"]}],"metrics":[{"scenarios":[{"lang":"en","value":"Any client with access to the DoT port (853) can keep all iserve children in a crash-restart loop denying DoT service"}],"cvssV4_0":{"baseScore":8.7,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","description":"CWE-416: Use After Free","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"NLnet Labs","orgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","dateUpdated":"2026-06-25T05:24:18.620Z"},"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":"2026-06-25T12:42:22.635356Z","id":"CVE-2026-12245","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-25T12:42:50.104Z"}}]}}}