CVE-2026-1642
Medium · 5.9CVSS
5.9
EPSS
0.4%
Published
Feb 4, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Mageia:9 | nginx | 0 | 1.26.3-1.2.mga9 |
| openSUSE:Tumbleweed | nginx | 0 | 1.29.5-1.1 |
Related vulnerabilities
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- CVE-2026-42946 A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that… Also affects nginx
- CVE-2026-42945 NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module… Also affects nginx
- CVE-2026-42934 NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module… Also affects nginx
- CVE-2026-42926 When NGINX Open Source is configured to proxy HTTP/2 traffic by setting… Also affects nginx
- CVE-2026-40701 NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssl_module module… Also affects nginx
- CVE-2026-40460 When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an… Also affects nginx