CVE-2026-40012

Information about ECS zero scoped answers might leak to clients that use a specific ECS

State: Published
Severity: 5.3 Medium
Published: Jun 25, 2026
Updated: Jun 25, 2026
Reserved: Apr 8, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	OX

Weaknesses

CWE-524 Use of Cache Containing Sensitive Information

Affected Products

Product	Versions
RecursorPowerDNS	5.2.0 to before 5.2.11Affected 5.3.0 to before 5.3.8Affected 5.4.0 to before 5.4.3Affected

References

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-08.html

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