CVE-2026-40208
Denial of service via DoH3 queries
LOW
3.7
CVSS Score
Published: June 25, 2026 at 12:22 PM UTC
Updated: October 25, 2026 at 11:10 PM UTC
2 products affected across 1 vendorDNSdistAuthoritative
Using DNSdist by PowerDNS?
Get instant alerts when new vulnerabilities affect DNSdist - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
LOW3.7
Exploit prediction
EPSS 0.4%
SSVC
No known exploit
Description
An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 1.9.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.7, so it looks safe — our inference, not a vendor statement
All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.
References (1)
SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
3.7LOWOX
- Attack Vector
- NETWORK
- Complexity
- HIGH
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- LOW
Vector?
Quick Info
StatusDEFERRED
CWE
CWE-705
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card