{"id":"CVE-2026-12490","state":"PUBLISHED","title":"Bypass of client certificate verification with transfer over TLS","description":"When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.","publishedAt":"2026-06-25T05:24:41.814Z","updatedAt":"2026-06-25T12:41:18.144Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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":"4.10.1","status":"affected","lessThan":"4.14.3","versionType":"semver"}]}],"references":["https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12490.txt"],"weaknesses":["CWE-306","CWE-284"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/12xxx/CVE-2026-12490.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-12490","state":"PUBLISHED","datePublished":"2026-06-25T05:24:41.814Z","dateUpdated":"2026-06-25T12:41:18.144Z","assignerShortName":"NLnet Labs","assignerOrgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","dateReserved":"2026-06-17T06:44:23.686Z"},"containers":{"cna":{"title":"Bypass of client certificate verification with transfer over TLS","descriptions":[{"lang":"en","value":"When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match."}],"affected":[{"vendor":"NLnet Labs","product":"NSD","defaultStatus":"unaffected","versions":[{"version":"4.10.1","status":"affected","lessThan":"4.14.3","versionType":"semver"}]}],"references":[{"url":"https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12490.txt","tags":["vendor-advisory"]}],"metrics":[{"scenarios":[{"lang":"en","value":"Transfer security restrictions for client certificates can be bypassed completely if the attacker can match the other access control conditions, and the tls-auth-xfr-only option is not explicitly set to yes (which it by default is not)"}],"cvssV4_0":{"baseScore":8.2,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"},{"cweId":"CWE-284","description":"CWE-284: Improper Access Control","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"NLnet Labs","orgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","dateUpdated":"2026-06-25T05:24:41.814Z"},"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":"2026-06-15T00:00:00.000Z","value":"Issue reported by Qifan Zhang"},{"lang":"en","time":"2026-06-16T00:00:00.000Z","value":"NLnet Labs shares patch"},{"lang":"en","time":"2026-06-17T00:00:00.000Z","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":"2026-06-25T12:40:01.913311Z","id":"CVE-2026-12490","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-25T12:41:18.144Z"}}]}}}