CVE-2026-33600

Null pointer dereference in RPZ transfer

4.4 MediumFix available

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.52%Up 0.5 points since Apr 22, 2026

What each source reports

CVE List Score used 4.4

Null pointer dereference in RPZ transfer

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Record: CVE-2026-33600
CVSS 3.1: 4.4 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

EUVDEUVD-2026-24731 4.4

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Record: EUVD-2026-24731
CVSS 3.1: 4.4 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-m52j-g834-6q2q 4.4

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused...

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Record: GHSA-m52j-g834-6q2q
CVSS 3.1: 4.4 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

NVD 4.4

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Record: CVE-2026-33600
CVSS 3.1: 4.4 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1: 4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

OSVALPINE-CVE-2026-33600 4.9

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Record: ALPINE-CVE-2026-33600
CVSS 3.1: 4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

OSV 4.4

Null pointer dereference in RPZ transfer

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Record: CVE-2026-33600
CVSS 3.1: 4.4 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-33600 4.9

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Record: DEBIAN-CVE-2026-33600
CVSS 3.1: 4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-33600 4.4

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Record: UBUNTU-CVE-2026-33600
CVSS 3.1: 4.4 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1: 4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

powerdns recursor

Affected packages

Affected packages
Package	Affected	Fixed
`pdns-recursor` Alpine:v3.23	before 5.3.6-r0	5.3.6-r0
`pdns-recursor` Alpine:v3.24	before 5.4.1-r0	5.4.1-r0
`pdns-recursor` Debian:12	All versions, plus listed versions 4.8.4-14.8.6-14.8.7-14.8.8-14.8.8-1+deb12u1 Show 45 moreShow less 4.9.0-14.9.0-24.9.1-14.9.1-24.9.1-34.9.1-44.9.2-14.9.2-24.9.3-14.9.4-14.9.5-15.0.5-15.0.7-15.0.7-25.0.9-15.1.3-15.1.3-25.2.0-15.2.0-25.2.0-35.2.0-45.2.0-55.2.1-15.2.2-15.2.2-25.2.4-15.2.4-25.2.5-15.3.0-15.3.0-25.3.0-35.3.0-45.3.0-55.3.1-15.3.3-15.3.4-15.3.4-25.3.5-15.4.0-15.4.1-15.4.1-25.4.2-15.4.2-25.4.3-15.4.4-1	None known
`pdns-recursor` Debian:13	before 5.2.9-0+deb13u1, plus listed versions 5.2.4-25.2.4-2+deb13u15.2.5-15.2.6-0+deb13u15.2.7-0+deb13u15.2.8-0+deb13u1	5.2.9-0+deb13u1
`pdns-recursor` Debian:14	before 5.4.1-1, plus listed versions 5.2.4-25.2.5-15.3.0-15.3.0-25.3.0-3 Show 8 moreShow less 5.3.0-45.3.0-55.3.1-15.3.3-15.3.4-15.3.4-25.3.5-15.4.0-1	5.4.1-1
`pdns-recursor` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 3.7.3-14.0.0~alpha1-14.0.0~alpha1-24.0.0~alpha2-24.0.0~alpha2-2ubuntu0.14.0.0~alpha2-2ubuntu0.1+esm1	None known
`pdns-recursor` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 4.0.6-14.0.6-1build14.0.7-14.1.1-14.1.1-1build14.1.1-24.1.1-2ubuntu0.1~esm1	None known
`pdns-recursor` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 4.2.0-64.2.1-14.2.1-1build14.2.1-1build24.2.1-1ubuntu0.1~esm1	None known
`pdns-recursor` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 4.4.2-34.6.0-1ubuntu14.6.0-1ubuntu1+esm1	None known
`pdns-recursor` Ubuntu:24.04:LTS	All versions, plus listed versions 4.9.0-24.9.1-44.9.2-14.9.2-1build14.9.2-24.9.3-14.9.3-1build24.9.3-1build3	None known
`pdns-recursor` Ubuntu:25.10	All versions, plus listed versions 5.2.0-55.2.2-15.2.2-25.2.4-25.2.4-2build2	None known
`pdns-recursor` Ubuntu:26.10	All versions, plus listed versions 5.3.5-15.4.3-15.4.5-1	None known
`pdns-recursor` Ubuntu:26.04:LTS	All versions, plus listed versions 5.2.4-2build25.3.1-15.3.3-15.3.4-15.3.4-1build15.3.4-25.3.5-1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	affected, aliases, references	OSV
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-33600 is a medium vulnerability (CVSS 4.4) in Powerdns Recursor, published April 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.52%, the 44th percentile. Fixed in pdns-recursor 5.3.6-r0.

References

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Left out here: 5 versions. The JSON record has them.