High severity · published Apr 22, 2026
CVE-2026-33260
Insufficient input validation of internal webserver
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% 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
DN
DNSdist · PowerDNS
1.9.0 before 1.9.13; 2.0.0 before 2.0.4 · source: vendor, NVD
RE
Recursor · PowerDNS
5.4.0 before 5.4.1; 5.3.0 before 5.3.6; 5.2.0 before 5.2.9 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33260
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33260
Vendor Advisory
https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-2026-05.html
Broken Link
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html
Vendor Advisory
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.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