1. Home
  2. CVE Database
  3. CVE-2026-28755
MEDIUM · 5.4

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_ocs...

Vulnerability 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.

CVSS Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE

Affected Products

VendorProductVersions
F5Nginx Plusr33
F5Nginx Open Source>= 0.5.13, <= 0.9.7

Related Weaknesses (CWE)

CWE-863

References

FAQ

What is CVE-2026-28755?

CVE-2026-28755 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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_ocs...

How severe is CVE-2026-28755?

CVE-2026-28755 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-28755?

Check the references section above for vendor advisories and patch information. Affected products include: F5 Nginx Plus, F5 Nginx Open Source.