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CVE-2026-52690

Spoofed answers can mark an authoritative non-EDNS capable

MEDIUM
5.9
CVSS Score
Published: June 25, 2026 at 01:01 PM UTC
Updated: October 25, 2026 at 11:10 PM UTC
2 products affected across 1 vendorRecursorAuthoritative

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Spoofing replies to Recursor might mark an IP of an authoritative server as not supporting EDNS, causing valdiation of DNSSEC records served by that server to fail.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Recursor· Powerdns
90%
5.2.0 ≤ v < 5.2.115.3.0 ≤ v < 5.3.85.4.0 ≤ v < 5.4.35.2.05.3.05.4.0
Affected range stops below 5.2.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.3.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.3, so it looks safe — our inference, not a vendor statement
Authoritative· Powerdns
85%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMOX
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-290

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