What is the CVSS score of CVE-2026-33262?

CVE-2026-33262 has a CVSS 3.1 base score of 5.9 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Is there a patch available for CVE-2026-33262?

Yes, a patch is available for CVE-2026-33262. Update the affected software to the latest version immediately.

PowerDNS Recursor CVE-2026-33262

EUVD-2026-24729 MEDIUM

NULL Pointer Dereference (CWE-476)

2026-04-22 security@open-xchange.com

GHSA-ghrj-5797-7659

Denial Of Service Null Pointer Dereference Suse

5.9

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.9 MEDIUM

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

SUSE

MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Patch released

Apr 27, 2026 - 17:02 nvd

Patch available

Analysis Generated

Apr 22, 2026 - 13:10 vuln.today

Patch available

Apr 22, 2026 - 11:16 EUVD

EUVD ID Assigned

Apr 22, 2026 - 10:22 euvd

EUVD-2026-24729

Analysis Generated

Apr 22, 2026 - 10:22 vuln.today

CVE Published

Apr 22, 2026 - 10:16 nvd

MEDIUM 5.9

DescriptionCVE.org

An attacker can send replies that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service. Cookies are disabled by default.

AnalysisAI

Null pointer dereference in PowerDNS Recursor allows remote attackers to trigger a denial of service by sending crafted DNS replies that bypass a missing consistency check. The vulnerability affects Recursor versions 5.2.0 through 5.2.8, 5.3.0 through 5.3.5, and 5.4.0, with CVSS 5.9 reflecting high availability impact but requiring special network conditions (AC:H). No public exploit code identified at time of analysis.

Technical ContextAI

PowerDNS Recursor is a DNS recursive resolver that processes incoming DNS queries and replies. The vulnerability stems from insufficient validation when handling DNS reply messages, allowing a crafted reply to reach a code path that dereferences a null pointer without proper initialization or sanity checking. The missing consistency check fails to validate the state of internal data structures before dereferencing, a classic memory safety issue. The CVSS vector (AV:N/AC:H) indicates the attack requires network-level access but elevated complexity due to specific network conditions or timing requirements that must be satisfied for the null pointer dereference to occur. The note that 'cookies are disabled by default' suggests the vulnerability may relate to DNSSEC or DNS cookie validation mechanisms that, when absent, create a window for malformed replies to trigger the flaw.

RemediationAI

Upgrade PowerDNS Recursor to version 5.2.9, 5.3.6, 5.4.1 or later according to your current branch. For 5.2.x deployments, apply upgrade to 5.2.9; for 5.3.x, upgrade to 5.3.6; for 5.4.x, upgrade to 5.4.1. Until patching is feasible, implement network-level restrictions by limiting DNS reply sources to authorized upstream nameservers only - configure strict acl rules in recursor.conf to accept replies only from explicitly whitelisted IP addresses, which raises the bar for crafting malicious replies by requiring network proximity or BGP hijacking. This mitigation has minimal side effects if properly scoped but does not eliminate risk if an authorized upstream is compromised. Refer to the vendor advisory at https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html for detailed patching instructions.