CVE-2026-28753
NGINX ngx_mail_proxy_module vulnerability
3.7CVSSLOW
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.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:LIntegrityLow
A:NAvailabilityNone
Weaknesses
Affected Products
and 4 more affected products View all →
Exploitability
Official Patch Available
References
https://my.f5.com/manage/s/article/K000160367
my.f5.com
https://my.f5.com/manage/s/article/K000160367
my.f5.com
https://angie.software/angie/docs/oss_changes/#angie
angie.software
and 3 more references View all →
Timeline
Published
Mar 24, 2026
Last Updated
Mar 26, 2026
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