Bug 2492877 (CVE-2026-40209) - CVE-2026-40209 dnsdist: denial of service via IXFR queries
Summary: CVE-2026-40209 dnsdist: denial of service via IXFR queries
Keywords:
Status: NEW
Alias: CVE-2026-40209
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2493661 2493662
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-25 13:01 UTC by OSIDB Bzimport
Modified: 2026-06-26 19:40 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-06-25 13:01:45 UTC 
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.
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