CVE-2026-52690
Deferred Deferred - Pending Action

Recursor DNSSEC Validation Failure via Spoofed Replies

Publication date: 2026-06-25

Last updated on: 2026-06-25

Assigner: Open-Xchange

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.

CVSS Scores

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Meta Information

Published
2026-06-25
Last Modified
2026-06-25
Generated
2026-07-15
AI Q&A
2026-06-25
EPSS Evaluated
2026-07-14
NVD
CVE-2026-52690
EUVD
EUVD-2026-39360

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-290 This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

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Executive Summary

This vulnerability involves spoofing replies to a DNS Recursor, which can cause the Recursor to incorrectly mark an authoritative server's IP address as not supporting EDNS (Extension mechanisms for DNS). As a result, the validation of DNSSEC (DNS Security Extensions) records served by that authoritative server may fail.

Impact Analysis

The impact of this vulnerability is that DNSSEC validation may fail for records served by an authoritative server whose IP is incorrectly marked as not supporting EDNS. This can lead to denial of availability or disruption of DNS resolution services, as indicated by the CVSS score which notes a high impact on availability.

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