{"id":"CVE-2026-19033","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-19033","generatedAt":"2026-10-28T05:27:57.473Z","title":"This could allow an attacker that does not actually possess a valid TSIG signature to send unauthorized zone contents to a secondary server.","description":"For a secondary zone with transfers restricted by TSIG, `named` may start to serve the data provided in a zone transfer before the final message with the TSIG signature arrives. This could allow an attacker that does not actually possess a valid TSIG signature to send unauthorized zone contents to a secondary server. Although no TSIG signature ever arrives, `named` does not rollback to the pre-transfer state. To exploit the vulnerability, the transfer must be a multi-message TCP IXFR, as described by RFC 8945.\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.","published":"2026-09-16T15:17:33.000Z","lastModified":"2026-10-26T23:10:00.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-officer@isc.org","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L"},"cwe":["CWE-349"],"affected":[],"epss":{"score":0.0024,"percentile":0.15082,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://downloads.isc.org/isc/bind9/9.20.29","source":"security-officer@isc.org"},{"url":"https://downloads.isc.org/isc/bind9/9.21.26","source":"security-officer@isc.org"},{"url":"https://kb.isc.org/docs/cve-2026-19033","source":"security-officer@isc.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-19033","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}