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CVE-2026-91838— Networkmanager-sstp: networkmanager-sstp: local privilege escalation to root via shell injection in vpn profile fields

Quick assessment

Affected
GNOME NetworkManager-sstp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 NetworkManager-sstp 中发现了一个漏洞，这是 NetworkManager 的 SSTP VPN 插件。本地未授权用户可以通过将特殊字符（已知为 shell 元字符）嵌入到 VPN 连接配置文件字段（如 CA 证书或代理设置）中，从而利用此漏洞。这些未转义的字符随后由以 root 权限运行的 守护进程处理，允许攻击者在激活恶意 VPN 连接时以 elevated 权限执行任意命令。

CVSS 7.8 · High EPSS 0.10% · P1
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I. Basic Information for CVE-2026-91838

Vulnerability Information
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Vulnerability Title
Networkmanager-sstp: networkmanager-sstp: local privilege escalation to root via shell injection in vpn profile fields
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNOME NetworkManager-sstp 0 ~ * -

II. Public POCs for CVE-2026-91838

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III. Intelligence Information for CVE-2026-91838

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Other References for CVE-2026-91838 (3)

Same Patch Batch · GNOME · 2026-09-25 · 6 CVEs total

CVE-2026-91837 7.8 HIGH Networkmanager-iodine: networkmanager-iodine: local privilege escalation to root via names
CVE-2026-91841 7.8 HIGH Networkmanager-vpnc: networkmanager-vpnc: incomplete fix for cve-2018-10900 allows root pr
CVE-2026-91840 7.8 HIGH Networkmanager-vpnc: networkmanager-vpnc: local privilege escalation to root via newline i
CVE-2026-91839 7.8 HIGH Networkmanager-fortisslvpn: networkmanager-fortisslvpn: local privilege escalation to root
CVE-2026-97222 5.5 MEDIUM Gnumeric: gnumeric: heap use-after-free when opening a malformed workbook

IV. Related Vulnerabilities

Same vendor: GNOME
Same weakness: CWE-78

V. Comments for CVE-2026-91838

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