Tracker / CVE-2026-28753
CVE-2026-28753
Low 3.7
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
| f5 | nginx_open_source · 0.6.27 → 0.9.7 |
|---|---|
| f5 | nginx_open_source · 1.0.0 → 1.28.3 |
| f5 | nginx_open_source · 1.29.0 → 1.29.7 |
| f5 | nginx_plus |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.