Low severity · published Jun 25, 2026
CVE-2026-40011
Prometheus denial of service via crafted DNS queries
3.7
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 13% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DN
DNSdist · PowerDNS
1.9.0 before 1.9.15; 2.0.0 before 2.0.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40011
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40011
www.dnsdist.org
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html
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