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Vulnerability DatabaseCVE-2026-27651

CVE-2026-27651: 
NGINX vulnerability analysis and mitigation

When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait response header. 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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