Medium
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-28755
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:29 UTC · Revision 1
Source evidence
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.
osv:CVE-2026-28755
Complete source record
{
"id": "884df52095b1575590999276dcd21a73b5c333b347e7ac747ad601c3b549ccc6",
"url": "https://osv.dev/vulnerability/CVE-2026-28755",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-28755",
"summary": "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.",
"evidence": "osv:CVE-2026-28755",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-28755",
"aliases": [
"BIT-nginx-2026-28755",
"BIT-nginx-gateway-2026-28755",
"CVE-2026-28755"
],
"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
}
],
"affected": [
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"type": "GIT",
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],
"modified": "2026-10-24T10:30:40.153303671Z",
"provider": "osv",
"references": [
"https://my.f5.com/manage/s/article/K000160368"
],
"provider_metadata": {
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"evidence": "/id"
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},
"source_id": "core-osv",
"document_id": 434851,
"published_at": "2026-03-24T15:16:33.773+00:00"
}