CVE-2026-40211
MEDIUM
NVD
CVSS Score
5.3
Severity
MEDIUM
Published
Jun 25, 2026
Vendor
unknown
Description
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.