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3.7 Low

CVE-2026-28753 NGINX Plus and NGINX Open Source have a vulnerability in the ngx_mail_smtp_module module due to the improper handling of…

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.

Affected products and versions

Product Affected versions Fixed in
NGINX Open Source 1.29 1.29.0 → < 1.29.7 1.29.7
NGINX Open Source 0.6 0.6.27 → < 1.28.3 1.28.3
NGINX Plus Versions not published

References

Timeline

  1. Published
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The 35 CVEs of NGINX Open Source →
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