CVE-2026-28755CWE-863

NGINX ngx_stream_ssl_module vulnerability

Medium · published March 24, 2026

CVSS v4.0
5.3
EPSS
0%
Percentile
4.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00161 · 4.9th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-03-24T14:13Z
EPSS history
Timeline
  • 24 MAR 14:13Z
    NGINX ngx_stream_ssl_module vulnerability
    cvelistv5