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CVE-2026-27651

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CVE-2026-27651

Published: Mar 24, 2026

Modified: Mar 24, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

VendorProductVersions

F5

NGINX Open Source

affected
1.29.0 - < 1.29.7
affected
0.5.15 - < 1.28.3

F5

NGINX Plus

affected
R36 - < R36 P3
affected
R35 - < R35 P2
affected
R34 - < *
affected
R33 - < *
affected
R32 - < R32 P5

Weaknesses (CWE)

CWE-476

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

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