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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.

PUBLISHED Reserved 2026-04-10 | Published 2026-06-25 | Updated 2026-06-25 | Assigner OX




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

Problem types

Allocation of Resources Without Limits or Throttling

Product status

Default status
unaffected

1.9.0 (semver) before 1.9.15
affected

2.0.0 (semver) before 2.0.7
affected

Credits

Mehtab Zafar finder

References

www.dnsdist.org/...owerdns-advisory-for-dnsdist-2026-09.html

cve.org (CVE-2026-40211)

nvd.nist.gov (CVE-2026-40211)

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