MEDIUM 5.6 Microsoft

CVE-2025-53859

NGINX ngx_mail_smtp_module vulnerability

Microsoft Security Update 2025-Aug: NGINX ngx_mail_smtp_module vulnerability

Affected Products

cbl2 nginx 1.22.1-13 on CBL Mariner 2.0
azl3 nginx 1.25.4-4 on Azure Linux 3.0
cbl2 nginx 1.22.1-14 on CBL Mariner 2.0
azl3 nginx 1.25.4-5 on Azure Linux 3.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53859
https://nvd.nist.gov/vuln/detail/CVE-2025-53859

Published: 2025-08-12 · Source: Microsoft · Feed updated: 2026-08-10

This medium severity vulnerability with a CVSS score of 5.6 was published on 2025-08-12 via Microsoft. Affected: cbl2 nginx 1.22.1-13 on CBL Mariner 2.0, azl3 nginx 1.25.4-4 on Azure Linux 3.0, cbl2 nginx 1.22.1-14 on CBL Mariner 2.0 and 1 more.

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