CVE-2026-19033
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
Exploit Intelligence
EPSS data unavailable for this CVE.
References
Related Vulnerabilities
Other CWE-349 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2019-9535 | Critical | 9.8 | 2.5% | - | - |
| CVE-2026-32162 | High | 8.4 | 1.9% | - | Fix |
| CVE-2018-1131 | High | 8.8 | 1.3% | - | - |
| CVE-2021-21374 | High | 8.1 | 1.0% | - | Fix |
| CVE-2024-21094 | Low | 3.7 | 0.8% | - | Fix |
| CVE-2025-40778 | High | 8.6 | 0.7% | - | Fix |
Common questions
How do I fix CVE-2026-19033?
No published fix for CVE-2026-19033 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
How severe is CVE-2026-19033?
CVE-2026-19033 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-17.