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CVE-2026-40012— Information about ECS zero scoped answers might leak to clients that use a specific ECS

Quick assessment

Affected
PowerDNS Recursor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PowerDNS recursor是PowerDNS公司开源的一款域名系统递归解析器。 PowerDNS Recursor 5.2.0至5.2.11之前版本、5.3.0至5.3.8之前版本和5.4.0至5.4.3之前版本存在信息泄露漏洞，该漏洞源于ECS零范围答案被错误地存储在数据包缓存中，仅影响启用ECS的配置，可能导致信息泄露。

CVSS 5.3 · Medium EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1059.015

Affected Version Matrix 3

VendorProduct Version RangeStatus
PowerDNS Recursor 5.2.0< 5.2.11 affected
5.3.0< 5.3.8 affected
5.4.0< 5.4.3 affected
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I. Basic Information for CVE-2026-40012

Vulnerability Information
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Vulnerability Title
Information about ECS zero scoped answers might leak to clients that use a specific ECS
Source: CVE Program / CVE List V5
Vulnerability Description
ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
PowerDNS Recursor 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowerDNS recursor是PowerDNS公司开源的一款域名系统递归解析器。 PowerDNS Recursor 5.2.0至5.2.11之前版本、5.3.0至5.3.8之前版本和5.4.0至5.4.3之前版本存在信息泄露漏洞，该漏洞源于ECS零范围答案被错误地存储在数据包缓存中，仅影响启用ECS的配置，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PowerDNS Recursor 5.2.0 ~ 5.2.11 -

II. Public POCs for CVE-2026-40012

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III. Intelligence Information for CVE-2026-40012

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Vendor Advisories for CVE-2026-40012 (1)

Same Patch Batch · PowerDNS · 2026-06-25 · 14 CVEs total

CVE-2026-33612 7.5 HIGH ZoneToCache can poison the cache
CVE-2026-42387 5.9 MEDIUM Insufficient input validation in ZoneToCache
CVE-2026-42388 5.9 MEDIUM Missing input validation for catalog zones
CVE-2026-52690 5.9 MEDIUM Spoofed answers can mark an authoritative non-EDNS capable
CVE-2026-42390 5.3 MEDIUM ZONEMD validation can be bypassed
CVE-2026-42389 5.3 MEDIUM Reject more queries with invalid header values
CVE-2026-40209 5.3 MEDIUM Denial of service via IXFR queries
CVE-2026-40211 5.3 MEDIUM Denial of service via crafted DoH3 queries
CVE-2026-40210 4.8 MEDIUM Out-of-bounds read in SetMacAddrAction
CVE-2026-42005 4.3 MEDIUM Insufficient input validation of internal web server
CVE-2026-42004 3.7 LOW EDNS options smuggling
CVE-2026-40011 3.7 LOW Prometheus denial of service via crafted DNS queries
CVE-2026-40208 3.7 LOW Denial of service via DoH3 queries

IV. Related Vulnerabilities

Same product: Recursor
Same vendor: PowerDNS

V. Comments for CVE-2026-40012

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