docs.powerdns.com
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-08.html CVE-2026-40012
MEDIUM
Information about ECS zero scoped answers might leak to clients that use a specific ECS
Record summary
CVE-2026-40012 has a selected CVSS score of 5.3 (medium).
Description
ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableYes
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Jun 25, 2026 · Source: CVE List
Affected products and versions
1| Product | Source | Version range | Status |
|---|---|---|---|
Default status: unaffected | CVE List | 5.2.0 to < 5.2.11 | affected |
| 5.3.0 to < 5.3.8 | affected | ||
| 5.4.0 to < 5.4.3 | affected |
References
2nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-40012