CVE-2026-40011

Prometheus denial of service via crafted DNS queries

State: Published
Severity: 3.7 Low
Published: Jun 25, 2026
Updated: Jun 25, 2026
Reserved: Apr 8, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	3.7 Low	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N	OX

Weaknesses

CWE-116 Improper Encoding or Escaping of Output

Affected Products

Product	Versions
DNSdistPowerDNS	1.9.0 to before 1.9.15Affected 2.0.0 to before 2.0.7Affected

References

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

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