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    CVE-2026-1642

    A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side—along with conditions beyond the attacker's control—may be able to inject plain text data into the response from an upstream proxied server.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

    Published:Feb 4, 2026
    Last Modified:Apr 18, 2026
    EPS:Feb 4, 2026
    EPSS Score:0.00016
    CVSS Score:5.9

    Affected Products

    Vendor
    F5
    Product
    Nginx Gateway Fabric
    Vendor
    F5
    Product
    Nginx Ingress Controller
    Vendor
    F5
    Product
    Nginx Instance Manager
    Vendor
    F5
    Product
    Nginx Open Source
    Vendor
    F5
    Product
    Nginx Plus

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-66362 (CVSS 8.6) — Description: When NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerabil…
    CVE-2026-60005 (CVSS 8.8) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_slice_module module. When the slice dire…
    CVE-2026-32682 (CVSS 7.1) — When NGINX Gateway Fabric is configured using GRPCRoutes, an authenticated, remote attacker with permission to…
    CVE-2026-50107 (CVSS 8.6) — When NGINX Plus or NGINX Open Source is configured as the data plane for NGINX Gateway Fabric, an injection vu…
    CVE-2026-11311 (CVSS 8.6) — When NGINX Plus is configured as the data plane for NGINX Gateway Fabric, an injection vulnerability exists in…
    CVE-2026-48142 (CVSS 6.3) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When content is s…
    CVE-2026-42055 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module…
    CVE-2026-9256 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerabilit…
    CVE-2026-42946 (CVSS 8.3) — A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excess…
    CVE-2026-42945 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerabilit…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High