CVE-2026-40011Network attack vector

Metrics rejection via invalid dynamic-block serialization

Published Jun 25, 2026 · Updated Jun 25, 2026

Output encoding in PowerDNS DNSdist 1.9.0 through 1.9.14 and 2.0.0 through 2.0.6 lets remote attackers disrupt metric collection. The Prometheus exporter in dnsdist-web.cc serializes an attacker-influenced dynamic-block value into invalid metrics output that scrapers reject. Reachability requires suffix-based dynamic blocking through setSuffixMatchRule or setSuffixMatchRuleFFI, and monitoring resumes when the block expires.

CVSS severity3.7
Low
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Output encoding in PowerDNS DNSdist 1.9.0 through 1.9.14 and 2.0.0 through 2.0.6 lets remote attackers disrupt metric collection. The Prometheus exporter in dnsdist-web.cc serializes an attacker-influenced dynamic-block value into invalid metrics output that scrapers reject. Reachability requires suffix-based dynamic blocking through setSuffixMatchRule or setSuffixMatchRuleFFI, and monitoring resumes when the block expires.

The record

CVE
CVE-2026-40011
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
PowerDNS
Product
DNSdist
Classifications
CWE-116, T1498.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.9.0 <1.9.15
  2. Affected versionversion=2.0.0 <2.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PowerDNS · DNSdistversion=1.9.0 <1.9.15; version=2.0.0 <2.0.7

Published CVSS scores

3.7PowerDNSCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
T1498.001Direct Network Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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