High severity · published May 21, 2026
CVE-2026-42000
Insufficient Validation of Names During AXFR
8.6
CVSS
0.2%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% 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-2026-42000
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42000
Broken Link
https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-2026-06.html
More from Authoritative
9.8
CVE-2026-33608
Incomplete domain name sanitization during
9.8
CVE-2020-24698
An issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used
8.1
CVE-2020-24696
An issue was discovered in PowerDNS Authoritative through 4.3.0 when --enable-experimental-gss-tsig is used
7.5
CVE-2026-42002
Concurrency and locking defects in GSS-TSIG
7.5
CVE-2026-42001
Insufficient Validation of Autoprimary SOA Queries