CVE-2026-33262Network attack vector

Service crash via inconsistent cookie reply

Published Apr 22, 2026 · Updated Apr 22, 2026

Null pointer dereference in affected PowerDNS Recursor releases allows remote attackers to crash the DNS service via crafted replies. The outgoing-cookie reply path in lwres.cc omits a consistency check and dereferences a null pointer while processing a malformed DNS response. Exploitation requires outgoing DNS cookies to be enabled, a nondefault setting, and interrupts recursive DNS resolution without system compromise.

CVSS severity5.9
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in affected PowerDNS Recursor releases allows remote attackers to crash the DNS service via crafted replies. The outgoing-cookie reply path in lwres.cc omits a consistency check and dereferences a null pointer while processing a malformed DNS response. Exploitation requires outgoing DNS cookies to be enabled, a nondefault setting, and interrupts recursive DNS resolution without system compromise.

The record

CVE
CVE-2026-33262
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
PowerDNS
Product
PowerDNS Recursor
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=5.2.0 <5.2.9
  2. Affected versionversion=5.3.0 <5.3.6
  3. Affected versionversion=5.4.0 <5.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PowerDNS · PowerDNS Recursorversion=5.2.0 <5.2.9; version=5.3.0 <5.3.6; version=5.4.0 <5.4.1

Published CVSS scores

5.9Open-XchangeCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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