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PowerDNS Recursor EUVDEUVD-2026-39352

| CVE-2026-33612 HIGH
Acceptance of Extraneous Untrusted Data With Trusted Data (CWE-349)
2026-06-25 security@open-xchange.com GHSA-mc43-3p9f-8c28
Information Disclosure Suse
7.5
CVSS 3.1 · Vendor: open-xchange
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Severity by source

Vendor (open-xchange) PRIMARY
7.5 HIGH
AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L
vuln.today AI
7.5 HIGH

Attacker is the upstream authoritative server so PR:N, but must control a ZoneToCache-configured source and craft accepted data, so AC:H; poisoned cache affects downstream clients (S:C) with integrity impact (I:H).

3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N
SUSE
HIGH
qualitative

Primary rating from Vendor (open-xchange).

CVSS VectorVendor: open-xchange

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
Low

Lifecycle Timeline

2
Patch available
Jun 25, 2026 - 14:16 EUVD
Analysis Generated
Jun 25, 2026 - 13:30 vuln.today

DescriptionCVE.org

A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to cache poisoning.

AnalysisAI

Cache poisoning in PowerDNS Recursor allows a malicious or compromised authoritative DNS server to inject forged records by returning a crafted zone that the resolver ingests through its ZoneToCache feature. Because the poisoned data lands in the shared recursor cache, all downstream clients can be served attacker-controlled answers, enabling traffic redirection and spoofing. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Control or compromise configured authoritative server
Delivery
Recursor triggers ZoneToCache zone fetch
Exploit
Return crafted zone with forged records
Execution
Poisoned records loaded into recursor cache
Impact
Clients served spoofed DNS answers
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the PowerDNS Recursor be explicitly configured to use the ZoneToCache feature and that it retrieves a zone from an authoritative server the attacker controls or has compromised - this is the concrete prerequisite, so default Recursor installations without ZoneToCache are not exposed. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L describes a network-reachable, unauthenticated (PR:N) attack with high complexity (AC:H) and a scope change (S:C) yielding high integrity and low availability impact but no confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker operates or compromises an authoritative DNS server that a target PowerDNS Recursor is configured to retrieve a zone from via ZoneToCache. When the recursor performs its scheduled zone retrieval, the attacker returns a crafted zone whose records are ingested into the cache, after which clients of that resolver receive forged answers (e.g., a phishing or malware host substituted for a legitimate domain). …
Remediation Upgrade PowerDNS Recursor to the fixed release identified in PowerDNS Advisory 2026-08 (https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-08.html); the exact patched version is not included in the provided data and must be taken from that advisory. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: identify all PowerDNS Recursor deployments and assess whether ZoneToCache is enabled; if not operationally critical, disable it immediately. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

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EUVD-2026-39352 vulnerability details – vuln.today
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