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CVE-2026-28755— NGINX ngx_stream_ssl_module vulnerability

Quick assessment

Affected
F5 NGINX Open Source
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

F5 NGINX Plus和F5 NGINX Open Source都是美国F5公司的产品。F5 NGINX Plus是一个基于软件的应用程序交付平台。F5 NGINX Open Source是一个高性能Web服务器、反向代理服务器、负载均衡器和API网关。 F5 NGINX Plus和F5 NGINX Open Source存在安全漏洞，该漏洞源于ngx_stream_ssl_module模块对已吊销证书处理不当，可能导致OCSP检查标识证书已吊销后TLS握手仍成功。

CVSS 5.4 · Medium EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-28755

Vulnerability Information
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Vulnerability Title
NGINX ngx_stream_ssl_module vulnerability
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
F5 NGINX Plus和F5 NGINX Open Source 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 NGINX Plus和F5 NGINX Open Source都是美国F5公司的产品。F5 NGINX Plus是一个基于软件的应用程序交付平台。F5 NGINX Open Source是一个高性能Web服务器、反向代理服务器、负载均衡器和API网关。 F5 NGINX Plus和F5 NGINX Open Source存在安全漏洞，该漏洞源于ngx_stream_ssl_module模块对已吊销证书处理不当，可能导致OCSP检查标识证书已吊销后TLS握手仍成功。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
F5 NGINX Open Source 1.29.0 ~ 1.29.7 -
F5 NGINX Plus R36 ~ R36 P3 -

II. Public POCs for CVE-2026-28755

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III. Intelligence Information for CVE-2026-28755

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Vendor Advisories for CVE-2026-28755 (1)

Same Patch Batch · F5 · 2026-03-24 · 6 CVEs total

CVE-2026-27654 8.2 HIGH NGINX ngx_http_dav_module vulnerability
CVE-2026-27784 7.8 HIGH NGINX ngx_http_mp4_module vulnerability
CVE-2026-32647 7.8 HIGH NGINX ngx_http_mp4_module vulnerability
CVE-2026-27651 7.5 HIGH NGINX ngx_mail_auth_http_module vulnerability
CVE-2026-28753 3.7 LOW NGINX ngx_mail_proxy_module vulnerability

IV. Related Vulnerabilities

Same product: NGINX Open Source
Same vendor: F5
Same weakness: CWE-863

V. Comments for CVE-2026-28755

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