CVE-2026-1642
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
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3Tags
Description
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.
Analysis
NGINX proxy configurations forwarding traffic to upstream TLS servers can be exploited by network-positioned attackers to inject unencrypted data into proxied responses, potentially compromising data integrity. This vulnerability affects NGINX OSS, NGINX Plus, and related products when specific upstream server conditions are present. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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