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CVE-2026-28755 is a medium-severity vulnerability in NGINX Open Source and NGINX Plus affecting the ngx_stream_ssl_module. When the stream module is configured with both ssl_verify_client on and ssl_ocsp on, revoked client certificates may be handled incorrectly during OCSP validation. According to the advisory, the TLS handshake can still succeed even after an OCSP check has identified the presented certificate as revoked. The issue is described as an OCSP response verification / OCSP result bypass in the stream module. Affected NGINX Open Source versions are 1.27.2 through 1.29.6; versions 1.29.7+ and 1.28.3+ are reported as not vulnerable.
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ngx_stream_ssl_module OCSP client-certificate revocation enforcement path. In practice, this means disabling affected configurations or restricting access to services using ssl_verify_client on together with ssl_ocsp on in the stream module until fixed versions can be deployed. Additional compensating controls such as network-level access restrictions and short-lived client certificates may reduce risk, but the content does not provide an official vendor mitigation beyond upgrading.Patch, then assume compromise.
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Cross-references every affected SKU, including bundled OEM variants.
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