Medium severity · published Apr 22, 2026
CVE-2026-33611
Insufficient validation of HTTPS and SVCB records
4.9
CVSS
0.4%
EPSS
No
On KEV
Description
An operator allowed to use the REST API can cause the Authoritative server to produce invalid HTTPS or SVCB record data, which can in turn cause LMDB database corruption, if using the LMDB backend.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% 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-2026-33611
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33611
Broken Link
https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-2026-05.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
8.6
CVE-2026-42000
Insufficient Validation of Names During AXFR
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