CVE-2026-40209

Denial of service via IXFR queries

Medium · published June 25, 2026

CVSS v3.1
5.3
EPSS
1%
Percentile
52.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00700 · 52.6th percentile
Published
2026-06-25T12:23Z
EPSS history
Timeline
  • 25 JUN 12:23Z
    Denial of service via IXFR queries
    cvelistv5