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Vulnerability DatabaseCVE-2026-28753

CVE-2026-28753: 
NGINX vulnerability analysis and mitigation

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_mail_smtp_module module due to the improper handling of CRLF sequences in DNS responses. This allows an attacker-controlled DNS server to inject arbitrary headers into SMTP upstream requests, leading to potential request manipulation. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Source: NVD

Related NGINX vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-27654HIGH8.8
  • NGINXNGINX
  • nginx
NoYesMar 24, 2026
CVE-2026-32647HIGH8.5
  • NGINXNGINX
  • nginx-1.29
NoYesMar 24, 2026
CVE-2026-27784HIGH8.5
  • NGINXNGINX
  • nginx-core
NoYesMar 24, 2026
CVE-2026-28753MEDIUM6.3
  • NGINXNGINX
  • nginx-mod-http-perl
NoYesMar 24, 2026
CVE-2026-28755MEDIUM5.3
  • NGINXNGINX
  • nginx-all-modules
NoYesMar 24, 2026

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