NetSight
IP …
high7.5

CVE-2026-27651

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.

Impact

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.

Affected products

VendorProductAffected versions
F5Nginx Open Source
from 0.5.15 through 0.9.7
from 1.0.0 before 1.28.3
from 1.29.0 before 1.29.7
F5Nginx Plus
from r33 before r35
Versions r32, r35, r36

Weakness classification

CWE-476

References