CVE-2026-28755 MEDIUM

CVE-2026-28755: NGINX ngx_stream_ssl_module vulnerability

Vendor F5
Product NGINX Open Source
Weakness CWE-863 · Incorrect authorization
Published March 24, 2026
Last update March 24, 2026

CVSS base score

5.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

What the vulnerability does

Description

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.

Key dates

Disclosure timeline

March 24, 2026 CVE published
March 24, 2026 Record updated