UBUNTU-CVE-2026-28755

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-28755
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-28755.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-28755
Upstream
Downstream
Related
Published
2026-03-24T15:16:00Z
Modified
2026-04-28T16:37:11Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
  • 5.3 (Medium) CVSS_V4 - 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 CVSS Calculator
  • Ubuntu - medium
Summary
[none]
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.

References

Affected packages

Ubuntu:24.04:LTS / nginx

Package

Name
nginx
Purl
pkg:deb/ubuntu/nginx@1.24.0-2ubuntu7.7?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.24.0-2ubuntu7.7

Affected versions

1.*
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_name": "libnginx-mod-mail",
            "binary_version": "1.24.0-2ubuntu7.7"
        },
        {
            "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"

Ubuntu:25.10 / nginx

Package

Name
nginx
Purl
pkg:deb/ubuntu/nginx@1.28.0-6ubuntu1.2?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.28.0-6ubuntu1.2

Affected versions

1.*
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"