🛡️ CVE-2026-55005 — exchange-server

🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-122 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-55005 is classified as CWE-122: Heap-based Buffer Overflow. A write past the end of a heap allocation corrupts allocator metadata or neighbouring objects.

Affected software

CVE-2026-55005 is recorded against 2 packages.

  • exchange-server
  • exchange-server-subscription-edition (fixed in 15.02.2562.045)

Timeline and source

Published on 14 July 2026 and last revised on 24 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

msrc.microsoft.com

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-122
Public Exploit ✅ No
Source NVD
Published 2026-07-14
Updated 2026-08-11
Modified 2026-07-24
Fix URL N/A

Affected Packages

Software From version Fixed in
exchange-server — —
exchange-server-subscription-edition — 15.02.2562.045

Similar Threats

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