Critical severity · published Apr 22, 2026
CVE-2026-33608
Incomplete domain name sanitization during
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
An attacker can send a notify request that causes a new secondary domain to be added to the bind backend, but causes said backend to update its configuration to an invalid one, leading to the backend no longer able to run on the next restart, requiring manual operation to fix it.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AU
Authoritative · PowerDNS
5.0.0 before 5.0.4; 4.9.0 before 4.9.14 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33608
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33608
Broken Link
https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-2026-05.html
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