UBUNTU-CVE-2026-11771

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Source
https://ubuntu.com/security/CVE-2026-11771
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11771.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-11771
Upstream
Downstream
Related
Published
2026-07-03T00:00:00Z
Modified
2026-08-06T22:15:23Z
Severity
  • 7.0 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

OpenVPN version 2.1.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows attackers via an off-by-one buffer write in the NTLM proxy authentication to potentially cause a crash via a crafted NTLM response from a malicious proxy server

References

Affected packages

Ubuntu:24.04:LTS / openvpn

Package

Name
openvpn
Purl
pkg:deb/ubuntu/openvpn?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.6.19-0ubuntu0.24.04.3

Affected versions

2.*
2.6.5-0ubuntu1
2.6.7-1ubuntu1
2.6.9-1ubuntu2
2.6.9-1ubuntu3
2.6.9-1ubuntu4
2.6.9-1ubuntu4.1
2.6.12-0ubuntu0.24.04.1
2.6.12-0ubuntu0.24.04.3
2.6.14-0ubuntu0.24.04.1
2.6.14-0ubuntu0.24.04.2
2.6.14-0ubuntu0.24.04.3
2.6.19-0ubuntu0.24.04.1
2.6.19-0ubuntu0.24.04.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "openvpn",
            "binary_version": "2.6.19-0ubuntu0.24.04.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11771.json"

Ubuntu:25.10 / openvpn

Package

Name
openvpn
Purl
pkg:deb/ubuntu/openvpn?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.6.13-1ubuntu3
2.6.14-1ubuntu1
2.6.14-2ubuntu1
2.6.14-2ubuntu1.1
2.6.19-0ubuntu0.25.10.1
2.6.19-0ubuntu0.25.10.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openvpn",
            "binary_version": "2.6.19-0ubuntu0.25.10.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11771.json"

Ubuntu:26.04:LTS / openvpn

Package

Name
openvpn
Purl
pkg:deb/ubuntu/openvpn?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.7.0-1ubuntu1.2

Affected versions

2.*
2.6.14-2ubuntu1
2.6.15-1ubuntu1
2.7.0~rc5-1ubuntu5
2.7.0~rc6-1ubuntu1
2.7.0-1ubuntu1
2.7.0-1ubuntu1.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "openvpn",
            "binary_version": "2.7.0-1ubuntu1.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11771.json"