CVE-2026-28755 — NGINX ngx_stream_ssl_module vulnerability

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
F5 / NGINX Open Source	affected 1.29.0 before 1.29.7; affected 1.27.2 before 1.28.3
F5 / NGINX Plus	affected R36 before R36 P3; affected R35 before R35 P2; affected R34 before ; affected R33 before

CWE

CWE-863

References

https://my.f5.com/manage/s/article/K000160368

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.