UpHeron
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Servers and applications

CVE-2025-53859

NGINX Open Source and NGINX Plus have a vulnerability in the ngx_mail_smtp_module that might allow an unauthenticated attacker to over-read NGINX SMTP authentication process memory; as a result, the server side may leak arbitrary bytes sent in a request to the authentication server. This issue happens during the NGINX SMTP authentication process and requires the attacker to make preparations…

Severity
Medium 6.3
Published
13 Aug 2025
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
1.29.1
Sources
NVD

Affected software

SoftwareAffected versions
nginxServers and applications · cpe:a:f5:nginx_open_source
  • From 0.7.22 before 1.29.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-53859
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-53859