F5 · Nginx Plus · CVE-2026-28755
**Name of the Vulnerable Software and Affected Versions**
NGINX Plus (affected versions not specified)
NGINX Open Source (affected versions not specified)
**Description**
The `ngx stream ssl module` module contains an issue with the improper handling of revoked certificates. When configured with the `ssl verify client` on and `ssl ocsp` on directives, the TLS handshake may succeed even if an Online Certificate Status Protocol (OCSP) check identifies the certificate as revoked. This flaw in the authorization procedure could allow a remote attacker to bypass security restrictions and gain unauthorized access to protected information.
**Recommendations**
At the moment, there is no information about a newer version that contains a fix for this vulnerability.