Bug 2450791 (CVE-2026-27651) - CVE-2026-27651 NGINX: NGINX: Denial of Service via undisclosed requests when ngx_mail_auth_http_module is enabled
Summary: CVE-2026-27651 NGINX: NGINX: Denial of Service via undisclosed requests when ...
Keywords:
Status: NEW
Alias: CVE-2026-27651
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2450834 2450837 2450838 2450839
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-24 15:02 UTC by OSIDB Bzimport
Modified: 2026-03-24 17:11 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-03-24 15:02:57 UTC 
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.
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