Security Advisory

CVE-2026-28753

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-03-24 14:13:26

Last updated 2026-03-24 15:24:34

Assigner f5

State PUBLISHED

Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_mail_smtp_module module due to the improper handling of CRLF sequences in DNS responses. This allows an attacker-controlled DNS server to inject arbitrary headers into SMTP upstream requests, leading to potential request manipulation. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

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