CVE-2026-24029Network attack vector

Unauthenticated DoH access via skipped ACL check

Published Mar 31, 2026 · Updated Mar 31, 2026

Incorrect authorization in PowerDNS DNSdist 1.9.0 through 1.9.11 and 2.0.0 through 2.0.2 allows remote attackers to bypass DoH ACLs. The nghttp2 DoH frontend omits the configured ACL check when early_acl_drop, exposed as earlyACLDrop in Lua, is disabled. This non-default setting lets unauthenticated clients submit DoH queries that the ACL would otherwise reject, without reported system compromise.

CVSS severity6.5
Medium
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

Incorrect authorization in PowerDNS DNSdist 1.9.0 through 1.9.11 and 2.0.0 through 2.0.2 allows remote attackers to bypass DoH ACLs. The nghttp2 DoH frontend omits the configured ACL check when early_acl_drop, exposed as earlyACLDrop in Lua, is disabled. This non-default setting lets unauthenticated clients submit DoH queries that the ACL would otherwise reject, without reported system compromise.

The record

CVE
CVE-2026-24029
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
PowerDNS
Product
DNSdist
Classifications
CWE-863, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 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 <1.9.12
  2. Affected versionversion=2.0.0 <2.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PowerDNS · DNSdistversion=1.9.0 <1.9.12; version=2.0.0 <2.0.3

Published CVSS scores

6.5Open-XchangeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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