CVE-2026-78301
Out-of-zone database nodes can become authoritative zone cuts
- State
- Published
- Severity
- 5.8 Medium
- Published
- Sep 16, 2026
- Updated
- Sep 17, 2026
- Reserved
- Aug 24, 2026
Description
A malformed zone may contain an NS or DNAME node above its origin, which `named` treats as a zone cut. If an attacker inserts a malformed zone into a BIND authoritative server (e.g., via zone transfer), queries for names inside the configured zone then lose authoritative status and return an out-of-zone delegation. On a server that also provides recursion BIND can follow this locally sourced cut and cache attacker-supplied data, affecting names outside the configured zone. This situation persists as long as the malformed zone remains in the zone database. 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.8 Medium | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N | isc |
Weaknesses
- CWE-349 Acceptance of Extraneous Untrusted Data With Trusted Data
Affected Products
| Product | Versions |
|---|---|
BIND 9ISC |
|
References
- CVE-2026-78301vendor-advisory
- https://downloads.isc.org/isc/bind9/9.20.29patch
- https://downloads.isc.org/isc/bind9/9.21.26patch
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