Medium severity · published May 21, 2026
CVE-2026-42396
Insufficient Validation of Member Zone Data May Cause Catalog Zone Transfer to Fail
6.5
CVSS
0.4%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AU
Authoritative · PowerDNS
4.9.0 before 4.9.15; 5.0.0 before 5.0.5 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42396
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42396
Broken Link
https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-2026-06.html
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