CVE-2026-40210
Deferred Deferred - Pending Action

Out-of-Bounds Read in Open-Xchange SetMacAddrAction

Publication date: 2026-06-25

Last updated on: 2026-06-25

Assigner: Open-Xchange

Description
An out-of-bounds read might happen when SetMacAddrAction is used, potentially resulting in uninitialized memory being sent over the network or a crash.

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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-2026-40210
EUVD
EUVD-2026-39349

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
powerdns dnsdist to 2.0.6 (inc)
powerdns dnsdist 1.9.15
powerdns dnsdist 2.0.7

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-126 The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

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Executive Summary

This vulnerability involves an out-of-bounds read that can occur when the SetMacAddrAction function is used. This means that the software might read memory outside the intended boundaries, which can lead to uninitialized memory being sent over the network or cause the program to crash.

Impact Analysis

The impact of this vulnerability includes the potential exposure of uninitialized memory over the network, which could leak sensitive information. Additionally, it may cause the affected application to crash, leading to denial of service.

Mitigation Strategies

The CVE description does not provide specific mitigation steps or commands for CVE-2026-40210.

Since the vulnerability involves an out-of-bounds read triggered by the SetMacAddrAction in PowerDNS dnsdist, general best practices would include updating to a patched version once available or applying any vendor-recommended patches.

Compliance Impact

The vulnerability involves an out-of-bounds read that might result in uninitialized memory being sent over the network or cause a crash.

However, there is no specific information provided about how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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