{"id":"UBUNTU-CVE-2026-28755","details":"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.","modified":"2026-04-28T16:25:14.485223Z","published":"2026-03-24T15:16:00Z","related":["USN-8210-1"],"upstream":["CVE-2026-28755"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-28755"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-28755"},{"type":"REPORT","url":"https://my.f5.com/manage/s/article/K000160368"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8210-1"}],"affected":[{"package":{"name":"nginx","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/nginx@1.24.0-2ubuntu7.7?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.24.0-2ubuntu7.7"}]}],"versions":["1.24.0-1ubuntu1","1.24.0-2ubuntu1","1.24.0-2ubuntu2","1.24.0-2ubuntu3","1.24.0-2ubuntu4","1.24.0-2ubuntu6","1.24.0-2ubuntu7","1.24.0-2ubuntu7.1","1.24.0-2ubuntu7.3","1.24.0-2ubuntu7.4","1.24.0-2ubuntu7.5","1.24.0-2ubuntu7.6"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libnginx-mod-http-geoip","binary_version":"1.24.0-2ubuntu7.7"},{"binary_name":"libnginx-mod-http-image-filter","binary_version":"1.24.0-2ubuntu7.7"},{"binary_name":"libnginx-mod-http-perl","binary_version":"1.24.0-2ubuntu7.7"},{"binary_name":"libnginx-mod-http-xslt-filter","binary_version":"1.24.0-2ubuntu7.7"},{"binary_version":"1.24.0-2ubuntu7.7","binary_name":"libnginx-mod-mail"},{"binary_name":"libnginx-mod-stream","binary_version":"1.24.0-2ubuntu7.7"},{"binary_name":"libnginx-mod-stream-geoip","binary_version":"1.24.0-2ubuntu7.7"},{"binary_name":"nginx","binary_version":"1.24.0-2ubuntu7.7"},{"binary_name":"nginx-common","binary_version":"1.24.0-2ubuntu7.7"},{"binary_name":"nginx-core","binary_version":"1.24.0-2ubuntu7.7"},{"binary_name":"nginx-extras","binary_version":"1.24.0-2ubuntu7.7"},{"binary_name":"nginx-full","binary_version":"1.24.0-2ubuntu7.7"},{"binary_name":"nginx-light","binary_version":"1.24.0-2ubuntu7.7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28755.json"}},{"package":{"name":"nginx","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/nginx@1.28.0-6ubuntu1.2?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.28.0-6ubuntu1.2"}]}],"versions":["1.26.3-2ubuntu1","1.26.3-3ubuntu1","1.26.3-3ubuntu2","1.26.3-3ubuntu3","1.28.0-3ubuntu1","1.28.0-4ubuntu1","1.28.0-6ubuntu1","1.28.0-6ubuntu1.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libnginx-mod-http-geoip","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"libnginx-mod-http-image-filter","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"libnginx-mod-http-perl","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"libnginx-mod-http-xslt-filter","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"libnginx-mod-mail","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"libnginx-mod-stream","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"libnginx-mod-stream-geoip","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"nginx","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"nginx-common","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"nginx-core","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"nginx-extras","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"nginx-full","binary_version":"1.28.0-6ubuntu1.2"},{"binary_name":"nginx-light","binary_version":"1.28.0-6ubuntu1.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28755.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"},{"type":"CVSS_V4","score":"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"},{"type":"Ubuntu","score":"medium"}]}