CVE-2026-40011
Prometheus denial of service via crafted DNS queries
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.
INFO
Published Date :
June 25, 2026, 1:16 p.m.
Last Modified :
June 25, 2026, 4 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | LOW | 8ce71d90-2354-404b-a86e-bec2cc4e6981 | ||||
| CVSS 3.1 | LOW | [email protected] |
Solution
- Filter crafted DNS queries that trigger invalid output.
- Validate dynamic block insertion values.
- Monitor and alert on endpoint rejections.
- Update system to handle dynamic blocks gracefully.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40011.
| URL | Resource |
|---|---|
| https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40011 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40011
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40011 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40011 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 25, 2026
Action Type Old Value New Value Added CWE CWE-116 Added SSVC {'id': 'CVE-2026-40011', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-25T13:23:09.989984Z'} -
New CVE Received by [email protected]
Jun. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/PowerDNS/pdns', 'vendor': 'PowerDNS', 'modules': ['Prometheus export'], 'product': 'DNSdist', 'versions': [{'status': 'affected', 'version': '1.9.0', 'lessThan': '1.9.15', 'versionType': 'semver'}, {'status': 'affected', 'version': '2.0.0', 'lessThan': '2.0.7', 'versionType': 'semver'}], 'packageName': 'dnsdist', 'programFiles': ['dnsdist-web.cc'], 'collectionURL': 'https://repo.powerdns.com/', 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Added Reference https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html