CVE-2026-33256

MEDIUM 5.3

Unbounded memory allocation by internal web server

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	powerdns
Product	recursor
Published	Apr 22, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

PowerDNS / Recursor

5.4.0 < 5.4.1 5.3.0 < 5.3.6 5.2.0 < 5.2.9

References

NVD ↗ CVE.org ↗ EPSS Data ↗

docs.powerdns.com: https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html

Credits

Ap4sh - Samy Medjahed and Ethicxz - Eliott Laurie Ap4sh / Ethicxz