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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade nginx | Mar 27, 2026 | Mar 24, 2026 |
| Amazon Linux Ami 2 | — | Upgrade nginx-coreUpgrade nginx-mod-http-image-filterUpgrade nginx-debuginfoUpgrade nginx-mod-http-perlUpgrade nginx-mod-mailUpgrade nginx-mod-http-xslt-filterUpgrade nginx-all-modulesUpgrade nginx-mod-http-geoipUpgrade nginx-mod-streamUpgrade nginxUpgrade nginx-mod-develUpgrade nginx-filesystem | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade nginx-all-modulesUpgrade nginx-mod-mailUpgrade nginx-filesystemUpgrade nginx-debuginfoUpgrade nginx-mod-mail-debuginfoUpgrade nginx-mod-http-perlUpgrade nginx-debugsourceUpgrade nginxUpgrade nginx-mod-http-xslt-filter-debuginfoUpgrade nginx-mod-streamUpgrade nginx-mod-develUpgrade nginx-mod-http-image-filter-debuginfoUpgrade nginx-core-debuginfoUpgrade nginx-mod-http-image-filterUpgrade nginx-mod-http-perl-debuginfoUpgrade nginx-coreUpgrade nginx-mod-http-xslt-filterUpgrade nginx-mod-stream-debuginfo | Apr 14, 2026 | Mar 24, 2026 |
| Debian | — | Upgrade nginx | May 17, 2026 | May 17, 2026 |
| Gentoo Linux | — | Upgrade www-servers/nginx. | Aug 17, 2026 | Aug 17, 2026 |
| Nginx | — | Upgrade to nginx version 1.28.3Upgrade to nginx version 1.29.7 | Mar 27, 2026 | Mar 24, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Mar 24, 2026 |
| Ubuntu | — | Upgrade nginx-extras (Ubuntu Pro)Upgrade libnginx-mod-http-cache-purge (Ubuntu Pro)Upgrade libnginx-mod-http-perl (Ubuntu Pro)Upgrade libnginx-mod-http-lua (Ubuntu Pro)Upgrade libnginx-mod-http-xslt-filter (Ubuntu Pro)Upgrade nginx-extrasUpgrade libnginx-mod-http-ndk (Ubuntu Pro)Upgrade nginxUpgrade nginx-coreUpgrade libnginx-mod-stream (Ubuntu Pro)Upgrade nginx-fullUpgrade nginx-light (Ubuntu Pro)Upgrade libnginx-mod-http-image-filter (Ubuntu Pro)Upgrade nginx-lightUpgrade nginx-common (Ubuntu Pro)Upgrade libnginx-mod-mail (Ubuntu Pro)Upgrade libnginx-mod-http-dav-ext (Ubuntu Pro)Upgrade nginx (Ubuntu Pro)Upgrade libnginx-mod-http-fancyindex (Ubuntu Pro)Upgrade nginx-core (Ubuntu Pro)Upgrade libnginx-mod-http-echo (Ubuntu Pro)Upgrade libnginx-mod-http-auth-pam (Ubuntu Pro)Upgrade libnginx-mod-http-subs-filter (Ubuntu Pro)Upgrade libnginx-mod-http-headers-more-filter (Ubuntu Pro)Upgrade libnginx-mod-http-upstream-fair (Ubuntu Pro)Upgrade libnginx-mod-http-geoip (Ubuntu Pro)Upgrade libnginx-mod-rtmp (Ubuntu Pro)Upgrade nginx-naxsi (Ubuntu Pro)Upgrade libnginx-mod-http-uploadprogress (Ubuntu Pro)Upgrade libnginx-mod-nchan (Ubuntu Pro)Upgrade nginx-full (Ubuntu Pro) | Apr 28, 2026 | Apr 27, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jun 18, 2026 | Mar 24, 2026 |
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