Acceptance of extraneous untrusted data with trusted data in NGINX Plus and NGINX Open Source - CVE-2026-1642

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Main Vulnerability Database Vulnerabilities #VU122335

Acceptance of extraneous untrusted data with trusted data in NGINX Plus and NGINX Open Source - CVE-2026-1642

Published: February 5, 2026


Vulnerability identifier: #VU122335
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:H/SA:N]
CVE-ID: CVE-2026-1642
CWE-ID: CWE-349
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect handling of trusted and untrusted data when configured to proxy to upstream Transport Layer Security (TLS) servers. A remote unauthenticated attacker with an MITM position on the upstream server side can inject plain text data into the responses from an upstream proxied server and send them to clients. 


Affected software

NGINX Plus
NGINX Open Source
NGINX Instance Manager
NGINX Ingress Controller
Gentoo Linux
Debian Linux
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Real Time 15
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Ubuntu
Server Applications Module
openSUSE Leap
openEuler
Anolis OS
Fedora
NGINX Gateway Fabric
Oracle Communications Operations Monitor
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
nginx-mod-vts
nginx-mod-fancyindex
nginx-mod-headers-more
nginx-mod-brotli
nginx-mod-modsecurity
nginx (Ubuntu package)
nginx-mod-naxsi
nginx (Red Hat package)
nginx-filesystem
nginx-all-modules
nginx-mod-stream
nginx-mod-mail
nginx-mod-http-xslt-filter
nginx-mod-http-perl
nginx-mod-http-image-filter
nginx-mod-devel
nginx
nginx-debuginfo
nginx-debugsource
nginx-source
nginx (Debian package)
nginx-doc
nginx-core
www-servers/nginx

How to mitigate CVE-2026-1642

Install updates from vendor's website.

NGINX Plus - addressed in versions R32 P4, R35 P1, R36 P2
NGINX Open Source - addressed in versions 1.28.2, 1.29.5
nginx-mod-vts - addressed in versions 0.2.4-6.fc42, 0.2.4-6.fc43
nginx-mod-fancyindex - addressed in versions 0.5.2-15.fc42, 0.5.2-15.fc43
nginx-mod-headers-more - addressed in versions 0.39-6.fc42, 0.39-6.fc43
nginx-mod-brotli - addressed in versions 1.0.0~rc-6.fc42, 1.0.0~rc-6.fc43
nginx-mod-modsecurity - addressed in versions 1.0.4-7.fc42, 1.0.4-7.fc43
nginx (Ubuntu package) - addressed in versions 1.4.6-1ubuntu3.9+esm6, 1.10.3-0ubuntu0.16.04.5+esm7, 1.14.0-0ubuntu1.11+esm2, 1.18.0-0ubuntu1.7+esm1, 1.18.0-6ubuntu14.8, 1.24.0-2ubuntu7.6, 1.28.0-6ubuntu1.1
nginx-mod-naxsi - addressed in versions 1.6-14.fc42, 1.6-14.fc43
nginx (Red Hat package) - addressed in versions 1.20.1-10.el9_0.2, 1.20.1-14.el9_2.4, 1.20.1-16.el9_4.4, 1.20.1-24.el9_7.1, 1.26.3-1.el10_0.3
nginx-filesystem - update to 1.21.5-9
nginx-all-modules - update to 1.21.5-9
nginx-mod-stream - update to 1.21.5-9
nginx-mod-mail - update to 1.21.5-9
nginx-mod-http-xslt-filter - update to 1.21.5-9
nginx-mod-http-perl - update to 1.21.5-9
nginx-mod-http-image-filter - update to 1.21.5-9
nginx-mod-devel - update to 1.21.5-9
nginx - update to 1.21.5-9
nginx-debuginfo - update to 1.21.5-9
nginx-debugsource - update to 1.21.5-9
nginx - addressed in versions 1.21.5-150400.3.15.1, 1.21.5-150600.10.15.1
nginx-source - addressed in versions 1.21.5-150400.3.15.1, 1.21.5-150600.10.15.1
nginx-debugsource - addressed in versions 1.21.5-150400.3.15.1, 1.21.5-150600.10.15.1
nginx-debuginfo - addressed in versions 1.21.5-150400.3.15.1, 1.21.5-150600.10.15.1
nginx (Debian package) - addressed in versions 1.22.1-9+deb12u4, 1.26.3-3+deb13u2
nginx-filesystem - update to 1.26.2-4
nginx-doc - update to 1.26.2-4
nginx-all-modules - update to 1.26.2-4
nginx-mod-stream - update to 1.26.2-4
nginx-mod-mail - update to 1.26.2-4
nginx-mod-http-xslt-filter - update to 1.26.2-4
nginx-mod-http-perl - update to 1.26.2-4
nginx-mod-http-image-filter - update to 1.26.2-4
nginx-mod-devel - update to 1.26.2-4
nginx-core - update to 1.26.2-4
nginx - update to 1.26.2-4
nginx - addressed in versions 1.28.2-1.fc42, 1.28.2-1.fc43
www-servers/nginx - update to 1.31.3-r1

External References

Related Security Bulletins