All errata/c10f2/ALT-PU-2026-10173-3
ALT-PU-2026-10173-3

Package update dnsdist in branch c10f2

Version1.9.15-alt1
Task#423320
Published2026-06-29
Max severityMEDIUM
Severity:

Closed issues (7)

CVE-2026-40011
LOW3.7

An attacker sending a large number of crafted DNS queries might be able to trigger a dynamic block being inserted with a value causing invalid output to be produced in the prometheus endpoint. The prometheus endpoint will then be rejected by the scraper until the dynamic block expires.

Published: 2026-06-25Modified: 2026-06-25
CVSS 3.xLOW 3.7
CVSS:3.x/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
References
CVE-2026-40209
MEDIUM5.3

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.

Published: 2026-06-25Modified: 2026-06-25
CVSS 3.xMEDIUM 5.3
CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
CVE-2026-40211
MEDIUM5.3

An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memory condition, resulting in a denial of service.

Published: 2026-06-25Modified: 2026-06-25
CVSS 3.xMEDIUM 5.3
CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References