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CVE-2026-91839— Networkmanager-fortisslvpn: networkmanager-fortisslvpn: local privilege escalation to root via crlf injection in vpn profile credentials

Quick assessment

Affected
GNOME NetworkManager-fortisslvpn
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.

NetworkManager-fortisslvpn（NetworkManager 的 FortiSSLVPN 插件）中发现了一个漏洞。nm-fortisslvpn-service 在处理 VPN 连接配置文件凭据中的回车符/换行符（CR/LF）时存在缺陷。本地非特权用户可通过构造恶意 VPN 配置文件，注入额外的配置指令。当激活该构造的 VPN 连接时，可能导致以 root 权限执行任意代码。

CVSS 7.8 · High EPSS 0.20% · P9
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I. Basic Information for CVE-2026-91839

Vulnerability Information
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Vulnerability Title
Networkmanager-fortisslvpn: networkmanager-fortisslvpn: local privilege escalation to root via crlf injection in vpn profile credentials
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in NetworkManager-fortisslvpn, the FortiSSLVPN plugin for NetworkManager. The nm-fortisslvpn-service improperly handles carriage-return/line-feed (CR/LF) characters in VPN connection profile credentials. A local unprivileged user can exploit this by crafting a malicious VPN profile to inject additional configuration directives. This can lead to arbitrary code execution with root privileges when the crafted 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
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5

Affected Products

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

II. Public POCs for CVE-2026-91839

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-91839

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Other References for CVE-2026-91839 (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-2026-91838 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-2026-97222 5.5 MEDIUM Gnumeric: gnumeric: heap use-after-free when opening a malformed workbook

IV. Related Vulnerabilities

Same vendor: GNOME
Same weakness: CWE-93

V. Comments for CVE-2026-91839

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