CVE-2026-40209
Denial of service via IXFR queries
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Reserved
- Apr 10, 2026
Description
An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | OX |
Weaknesses
- CWE-772 Missing Release of Resource after Effective Lifetime
Affected Products
| Product | Versions |
|---|---|
DNSdistPowerDNS |
|
References
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