PowerDNS Recursor up to 5.2.10/5.3.7/5.4.2 Zone ZoneToCache denial of service
| CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
|---|---|---|
| 4.7 | $0-$5k | 1.23- |
Summary
A vulnerability, which was classified as problematic, has been found in PowerDNS Recursor up to 5.2.10/5.3.7/5.4.2. Affected by this vulnerability is the function ZoneToCache of the component Zone Handler. Performing a manipulation results in denial of service.
This vulnerability is reported as CVE-2026-42387. The attack is possible to be carried out remotely. No exploit exists.
It is advisable to upgrade the affected component.
Details
A vulnerability was found in PowerDNS Recursor up to 5.2.10/5.3.7/5.4.2. It has been classified as problematic. This affects the function ZoneToCache of the component Zone Handler. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:
A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to a crash of the Recursor due to insuffcient input validation.
The weakness was disclosed by nurmukhammyed. The advisory is shared at docs.powerdns.com. This vulnerability is uniquely identified as CVE-2026-42387 since 04/27/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.
Upgrading to version 5.2.11, 5.3.8 or 5.4.3 eliminates this vulnerability.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Product
Type
Vendor
Name
Version
- 5.2.0
- 5.2.1
- 5.2.2
- 5.2.3
- 5.2.4
- 5.2.5
- 5.2.6
- 5.2.7
- 5.2.8
- 5.2.9
- 5.2.10
- 5.3.0
- 5.3.1
- 5.3.2
- 5.3.3
- 5.3.4
- 5.3.5
- 5.3.6
- 5.3.7
- 5.4.0
- 5.4.1
- 5.4.2
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 4.8VulDB Meta Temp Score: 4.7
VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍
CNA Base Score: 5.9
CNA Vector: 🔒
CVSSv2
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| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
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| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Denial of serviceCWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒
Physical: No
Local: No
Remote: Yes
Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔒
Upgrade: Recursor 5.2.11/5.3.8/5.4.3
Timeline
04/27/2026 CVE reserved06/25/2026 Advisory disclosed
06/25/2026 VulDB entry created
06/25/2026 VulDB entry last update
Sources
Advisory: docs.powerdns.comResearcher: nurmukhammyed
Status: Confirmed
CVE: CVE-2026-42387 (🔒)
GCVE (CVE): GCVE-0-2026-42387
GCVE (VulDB): GCVE-100-373857
Entry
Created: 06/25/2026 16:42Changes: 06/25/2026 16:42 (66)
Complete: 🔍
Cache ID: 216::103
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
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