High
network-manager-sstp — security advisory
A flaw was found in NetworkManager-sstp, the SSTP VPN plugin for NetworkManager. A local unprivileged user can exploit this vulnerability by embedding special characters, known as shell metacharacters, into VPN connection profile fields such as CA certificate or proxy settings. These unescaped characters are then processed by the `pppd` daemon, which runs with root privileges, allowing the attacker to execute arbitrary commands with elevated permissions when a malicious VPN connection is activated.
- Products
- network-manager-sstp
- Affected versions
- 1.3.0-0ubuntu1, 1.3.1-1, 1.3.1-2, 1.3.2-1, 1.3.2-1build1, 1.3.2-1build2, 1.3.2-1build5, 1.3.2-1build6
- Fixed versions
- Not specified
- CVEs
- CVE-2026-91838
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:31 UTC · Revision 1
Source evidence
A flaw was found in NetworkManager-sstp, the SSTP VPN plugin for NetworkManager. A local unprivileged user can exploit this vulnerability by embedding special characters, known as shell metacharacters, into VPN connection profile fields such as CA certificate or proxy settings. These unescaped characters are then processed by the `pppd` daemon, which runs with root privileges, allowing the attacker to execute arbitrary commands with elevated permissions when a malicious VPN connection is activated.
osv:UBUNTU-CVE-2026-91838
network-manager-sstp
Fixed versions: Not specified
network-manager-sstp
Fixed versions: Not specified
network-manager-sstp
Fixed versions: Not specified
network-manager-sstp
Fixed versions: Not specified
Complete source record
{
"id": "71bf46df6513843c8568e590226c53bf207c2a44432d7612910b0f533c56cacc",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-91838",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-91838",
"summary": "A flaw was found in NetworkManager-sstp, the SSTP VPN plugin for NetworkManager. A local unprivileged user can exploit this vulnerability by embedding special characters, known as shell metacharacters, into VPN connection profile fields such as CA certificate or proxy settings. These unescaped characters are then processed by the `pppd` daemon, which runs with root privileges, allowing the attacker to execute arbitrary commands with elevated permissions when a malicious VPN connection is activated.",
"evidence": "osv:UBUNTU-CVE-2026-91838",
"products": [
{
"name": {
"value": "network-manager-sstp",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.0-0ubuntu1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "network-manager-sstp",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/1/versions"
},
{
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},
{
"value": "1.3.2-1",
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},
{
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{
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]
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
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"affected_versions": [
{
"value": "1.3.2-1build6",
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}
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},
{
"name": {
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},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.2-1build5",
"evidence": "/affected/3/versions"
},
{
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"evidence": "/affected/3/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-91838",
"aliases": [
"UBUNTU-CVE-2026-91838"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
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}
],
"package": {
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"purl": "pkg:deb/ubuntu/network-manager-sstp?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1.3.0-0ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-91838.json"
},
"ecosystem_specific": {
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},
{
"binary_name": "network-manager-sstp-gnome",
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}
]
}
},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/network-manager-sstp?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
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"1.3.1-2",
"1.3.2-1",
"1.3.2-1build1",
"1.3.2-1build2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-91838.json"
},
"ecosystem_specific": {
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{
"binary_name": "network-manager-sstp-gnome",
"binary_version": "1.3.2-1build2"
}
]
}
},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/network-manager-sstp?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1.3.2-1build6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-91838.json"
},
"ecosystem_specific": {
"binaries": [
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"binary_name": "network-manager-sstp",
"binary_version": "1.3.2-1build6"
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{
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]
}
},
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/network-manager-sstp?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.3.2-1build5",
"1.3.2-1build6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-91838.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "network-manager-sstp",
"binary_version": "1.3.2-1build6"
},
{
"binary_name": "network-manager-sstp-gnome",
"binary_version": "1.3.2-1build6"
}
]
}
}
],
"modified": "2026-10-17T13:01:17.255769668Z",
"provider": "osv",
"upstream": [
"CVE-2026-91838"
],
"references": [
"https://ubuntu.com/security/CVE-2026-91838",
"https://www.cve.org/CVERecord?id=CVE-2026-91838",
"https://gitlab.gnome.org/GNOME/network-manager-sstp/-/work_items/67",
"https://blogs.gnome.org/mcatanzaro/2026/09/15/privilege-escalation-vulnerabilities-in-networkmanager-plugins/"
]
},
"related_cves": [
{
"value": "CVE-2026-91838",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361509,
"published_at": "2026-09-25T18:17:00+00:00"
}