CVE-2026-40011

Prometheus denial of service via crafted DNS queries

CVSS 3.7 LOWEPSS 0.2%CWE-116

Vexday Risk Score

8Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 3.7EPSS 0.2%KEV nãoPoC —Patch —

Lifecycle

25 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

PowerDNS · DNSdist

Want to know if your infrastructure is exposed to this?

Talk to TrueHacking →

References

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