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Fencer Vulns
low 3.7

CVE-2026-40011 json

Prometheus denial of service via crafted DNS queries

published 2026-06-25 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-39346

cvss
3.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

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.

Patch / fix

  • PowerDNS DNSdist 1.9.15, 2.0.7
  • dnsdist Debian 13 1.9.15-0+deb13u1
  • dnsdist Debian 14 2.1.0-1

debian advisories DEBIAN-CVE-2026-40011

  • dnsdist SLES 16.0, SLES for SAP applications 16.0 1.9.15-160000.1.1

suse advisories SUSE-SU-2026:23123-1SUSE-SU-2026:23146-1

  • dnsdist openSUSE Leap 16.0 1.9.15-160000.1.1
  • dnsdist openSUSE Tumbleweed 2.0.7-1.1

opensuse advisories openSUSE-SU-2026:21533-1openSUSE-SU-2026:11411-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-40011 updated cvss 5.3

dnsdist: Prometheus denial of service via crafted DNS queries

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

  • PowerDNS DNSdist

Classification

Weakness
  • CWE-116 Improper Encoding or Escaping of Output

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.