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CVE-2026-91837— Networkmanager-iodine: networkmanager-iodine: local privilege escalation to root via nameserver option injection

Quick assessment

Affected
GNOME NetworkManager-iodine
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 的 iodine VPN 插件（NetworkManager-iodine）中发现了一个缺陷。本地非特权用户可利用处理 “nameserver” 设置时存在的漏洞，在建立 iodine VPN 连接过程中进行攻击。攻击者通过在 “nameserver” 值中嵌入 Shell 元字符（即能够执行命令的特殊字符），可以注入并执行任意命令。这些命令在应用程序放弃其提升的权限之前，以 root 权限运行，从而导致本地权限提升。

CVSS 7.8 · High EPSS 0.14% · P2
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I. Basic Information for CVE-2026-91837

Vulnerability Information
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Vulnerability Title
Networkmanager-iodine: networkmanager-iodine: local privilege escalation to root via nameserver option injection
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in NetworkManager-iodine, the iodine VPN plugin for NetworkManager. A local unprivileged user can exploit a vulnerability in how the 'nameserver' setting is processed when establishing an iodine VPN connection. By embedding shell metacharacters (special characters that can execute commands) in the 'nameserver' value, an attacker can inject and execute arbitrary commands. These commands run with root privileges before the application drops its elevated permissions, leading to local privilege escalation.
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-iodine 0 ~ * -

II. Public POCs for CVE-2026-91837

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III. Intelligence Information for CVE-2026-91837

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Other References for CVE-2026-91837 (3)

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

CVE-2026-91841 7.8 HIGH Networkmanager-vpnc: networkmanager-vpnc: incomplete fix for cve-2018-10900 allows root pr
CVE-2026-91838 7.8 HIGH Networkmanager-sstp: networkmanager-sstp: local privilege escalation to root via shell inj
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-2026-91837

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