CVE-2026-28755
Last modified
CVE-2026-28755 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. EPSS estimates a 0.13% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| F5 | Nginx Plus | r33 | — |
| F5 | Nginx Plus | r34 | — |
| F5 | Nginx Plus | r35 | P1 |
| F5 | Nginx Plus | r36 | — |
| F5 | Nginx Open Source | >= 0.5.13, <= 0.9.7 | — |
| F5 | Nginx Open Source | >= 1.27.2, < 1.28.3 | — |
| F5 | Nginx Open Source | >= 1.29.0, < 1.29.7 | — |
References
- https://my.f5.com/manage/s/article/K000160368Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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