Vulnerability Details CVE-2026-28755
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 0.9%
CVSS Severity
CVSS v3 Score 5.4
Products affected by CVE-2026-28755
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cpe:2.3:a:f5:nginx_open_source:*
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cpe:2.3:a:f5:nginx_open_source:1.28.2
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cpe:2.3:a:f5:nginx_open_source:1.29.0
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cpe:2.3:a:f5:nginx_open_source:1.29.5
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cpe:2.3:a:f5:nginx_plus:r33
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cpe:2.3:a:f5:nginx_plus:r34
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cpe:2.3:a:f5:nginx_plus:r35
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cpe:2.3:a:f5:nginx_plus:r36