CVE-2026-40211

MediumCVSS 5.3/10Last modified Oct 25, 2026

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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-770

Affected software

Vendor	Product	Versions
PowerDNS	DNSdist	>= 1.9.0, < 1.9.15; >= 2.0.0, < 2.0.7

References

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html

Timeline

Published: Jun 25, 2026
Last modified: Oct 25, 2026
NVD status: Deferred

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