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Vulnerabilities CVE-2026-27651

CVE-2026-27651

High
Open
TLP:CLEAR

NGINX ngx_mail_auth_http_module vulnerability

NVD CVE.org
Critical Infrastructure

AI Analysis

No AI analysis yet.

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.

Details

CVSS Score
7.5
EPSS Score
0.94%

57.7th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Mar 24, 2026
Last Modified
Jul 15, 2026
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