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CVE-2026-55005

nvd nist
Published: Jul 14, 2026Modified: Oct 14, 2026

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8.8
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 2.8 / Impact: 5.9
Source: secure@microsoft.com (Secondary)

Description

Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

Affected (4)

Microsoft
2 products
Exchange Server
Exchange Server Subscription Edition
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Microsoft
Exchange Server
Version 2016 cumulative_update_23
Exchange Server
Version 2019 cumulative_update_14
Exchange Server
Version 2019 cumulative_update_15
Exchange Server Subscription Edition
version < 15.02.2562.045

Related CWEs

CWE-122
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

References (1)

Source: secure@microsoft.com
Vendor Advisory

Timeline

No history available yet.