CVE-2026-28753

EUVD-2026-14885
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.
CRLF Injection
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
3.7 LOW
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 18.15%
Affected Products (NVD)
VendorProductVersion
f5nginx_open_source
0.6.27 ≤
𝑥
≤ 0.9.7
f5nginx_open_source
1.0.0 ≤
𝑥
< 1.28.3
f5nginx_open_source
1.29.0 ≤
𝑥
< 1.29.7
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
nginx
bookworm
1.22.1-9+deb12u9
fixed
bookworm (security)
1.22.1-9+deb12u9
fixed
bullseye
vulnerable
bullseye (security)
1.18.0-6.1+deb11u8
fixed
forky
1.30.1-7
fixed
sid
1.30.4-3
fixed
trixie
1.26.3-3+deb13u7
fixed
trixie (security)
1.26.3-3+deb13u7
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
nginx
bionic
Fixed 1.14.0-0ubuntu1.11+esm2
released
focal
Fixed 1.18.0-0ubuntu1.7+esm1
released
jammy
Fixed 1.18.0-6ubuntu14.10
released
noble
Fixed 1.24.0-2ubuntu7.7
released
questing
Fixed 1.28.0-6ubuntu1.2
released
resolute
not-affected
trusty
Fixed 1.4.6-1ubuntu3.9+esm6
released
xenial
Fixed 1.10.3-0ubuntu0.16.04.5+esm7
released
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
nginx
suse enterprise sap 15 SP4
1.21.5-150400.3.15.1
fixed
suse enterprise sap 15 SP5
1.21.5-150400.3.15.1
fixed
suse enterprise sap 15 SP7
1.21.5-150600.10.15.1
fixed
suse enterprise server 15 SP4
1.21.5-150400.3.15.1
fixed
suse enterprise server 15 SP5
1.21.5-150400.3.15.1
fixed
suse enterprise server 15 SP6
1.21.5-150600.10.15.1
fixed
suse enterprise server 15 SP7
1.21.5-150600.10.15.1
fixed
nginx-source
suse enterprise sap 15 SP4
1.21.5-150400.3.15.1
fixed
suse enterprise sap 15 SP5
1.21.5-150400.3.15.1
fixed
suse enterprise sap 15 SP7
1.21.5-150600.10.15.1
fixed
suse enterprise server 15 SP4
1.21.5-150400.3.15.1
fixed
suse enterprise server 15 SP5
1.21.5-150400.3.15.1
fixed
suse enterprise server 15 SP6
1.21.5-150600.10.15.1
fixed
suse enterprise server 15 SP7
1.21.5-150600.10.15.1
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
nginx
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-all-modules
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-core
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-core-debuginfo
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-debuginfo
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-debugsource
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-filesystem
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-devel
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-http-image-filter
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-http-image-filter-debuginfo
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-http-perl
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-http-perl-debuginfo
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-http-xslt-filter
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-http-xslt-filter-debuginfo
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-mail
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-mail-debuginfo
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-stream
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
nginx-mod-stream-debuginfo
Amazon Linux 2023
1:1.28.3-1.amzn2023.0.1
fixed
Azure Linux logo
Azure Linux Releases
Azure Package
Release
nginx
Azure Linux 3.0
0:1.28.3-1.azl3
fixed
CBL-Mariner 2.0
0:1.22.1-16.cm2
fixed
Common Weakness Enumeration
References
https://my.f5.com/manage/s/article/K000160367