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Description

A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection.

PUBLISHED Reserved 2026-03-23 | Published 2026-04-22 | Updated 2026-04-22 | 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 1.9.13
affected

2.0.0 (semver) before 2.0.4
affected

Credits

Mehtab Zafar finder

References

www.dnsdist.org/...owerdns-advisory-for-dnsdist-2026-04.html

cve.org (CVE-2026-33594)

nvd.nist.gov (CVE-2026-33594)

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