VULNERABILITY INTELLIGENCE

CVE-2026-27651

CVSS score7.5 HIGH
EPSS probability0.95%
CISA KEVNot currently listed
Published2026-03-24
Last modified2026-07-15
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

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.

Weakness classification

  • f5sirt@f5.com: CWE-476
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-476

Primary references