What is CVE-2026-40012?

CVE-2026-40012 is a medium-severity vulnerability in Powerdns Recursor, classified under Use of Cache Containing Sensitive Information. CVSS score: 5.3/10. Published 2026-06-25.

How severe is CVE-2026-40012?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Powerdns Recursor

CVE-2026-40012

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Powerdns Recursor — versions 5.2.0, 5.3.0, 5.4.0

Weakness classification (CWE)

CWE-524 — Use of Cache Containing Sensitive Information

References

security@open-xchange.com

Frequently asked questions

What is CVE-2026-40012?: CVE-2026-40012 is a medium-severity vulnerability in Powerdns Recursor, classified under Use of Cache Containing Sensitive Information. CVSS score: 5.3/10. Published 2026-06-25.
How severe is CVE-2026-40012?: Medium severity. CVSS v3 base score is 5.3 out of 10.