UBUNTU-CVE-2026-19033

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UBUNTU-CVE-2026-19033

Summary:

Details: 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. This 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.

References: https://ubuntu.com/security/CVE-2026-19033, https://www.cve.org/CVERecord?id=CVE-2026-19033, https://kb.isc.org/docs/cve-2026-19033, https://ubuntu.com/security/notices/USN-8929-1, https://ubuntu.com/security/notices/USN-8969-1