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CVE-2026-19033 is an insufficient verification of data authenticity flaw in BIND 9 named affecting TSIG-restricted secondary zones. During a multi-message TCP incremental zone transfer (IXFR), named can apply received deltas to the live secondary zone and begin serving them before receipt and validation of the final TSIG-signed message. If a valid final TSIG signature is never received, named does not restore the zone's pre-transfer state. An attacker without the TSIG key can therefore cause unauthorized DNS records to be retained in the secondary zone.
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A BIND 9 authorization flaw in TSIG-restricted multi-message TCP IXFR zone transfers. named can apply and serve transferred zone data before receiving and validating the final TSIG-signed message, allowing an unauthenticated attacker to inject unauthorized DNS zone contents into a secondary server.
A medium-severity, remotely exploitable BIND 9 flaw in which unauthenticated multi-message TCP IXFR transfer data can be applied and served by a secondary zone before final TSIG verification. An attacker can supply arbitrary zone data without possessing a valid TSIG signature.
A vulnerability affecting Debian Linux versions 12.0, 13.0, and 14.0. The provided CVSS v3 vector indicates network reachability with high attack complexity, no privileges or user interaction required, and potential high integrity and low availability impact.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
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YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
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