What is CVE-2026-55944?

CVE-2026-55944 is a critical-severity vulnerability in Microsoft Dynamics Nav 2018, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-14.

How severe is CVE-2026-55944?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Deserialization in Microsoft Dynamics Nav 2018

CVE-2026-55944

Deserialization of untrusted data in Microsoft Dynamics NAV allows an unauthorized attacker to execute code over a network.

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Microsoft Dynamics Nav 2018 — versions 1.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-55944?: CVE-2026-55944 is a critical-severity vulnerability in Microsoft Dynamics Nav 2018, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-07-14.
How severe is CVE-2026-55944?: Critical severity. CVSS v3 base score is 9.8 out of 10.