CVE-2026-40208— Denial of service via DoH3 queries
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-40208
Vulnerability Information
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Vulnerability Title
Denial of service via DoH3 queries
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
PowerDNS DNSdist 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowerDNS dnsdist是PowerDNS公司开源的一款高性能DNS流量分发与防护工具。 PowerDNS DNSdist 1.9.0版本至1.9.15之前版本和2.0.0版本至2.0.7之前版本存在处理逻辑错误漏洞，该漏洞源于处理逻辑错误，可能导致攻击者通过发送带有无效DATA帧的DoH3 GET查询来延迟处理DoH3查询。
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
II. Public POCs for CVE-2026-40208
| # | POC Description | Source Link | Shenlong Link |
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Vendor Advisories for CVE-2026-40208 (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-2026-40012 | 5.3 MEDIUM | Information about ECS zero scoped answers might leak to clients that use a specific ECS |
| 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 |
IV. Related Vulnerabilities
Same vendor: PowerDNS
- CVE-2026-52688
RRSIGs with too few labels can lead to bypass of DNSSEC wild - CVE-2026-52686
Wildcard CNAME proof validation bypass - CVE-2026-52684
Prefetch Feature Allows Persistent Ghost Domain Cache Poison - CVE-2026-42389
Reject more queries with invalid header values - CVE-2026-52690
Spoofed answers can mark an authoritative non-EDNS capable
V. Comments for CVE-2026-40208
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