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CVE-2026-91840— Networkmanager-vpnc: networkmanager-vpnc: local privilege escalation to root via newline injection in vpn username

Quick assessment

Affected
GNOME NetworkManager-vpnc
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-vpnc 中发现了一个漏洞。该漏洞允许本地未特权用户将权限提升为 root 权限。通过在 VPN 用户名字段中注入一个换行符，攻击者可以操纵 vpnc 配置，从而在激活恶意 VPN 连接时以 root 权限执行任意程序。

CVSS 7.8 · High EPSS 0.19% · P8
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I. Basic Information for CVE-2026-91840

Vulnerability Information
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Vulnerability Title
Networkmanager-vpnc: networkmanager-vpnc: local privilege escalation to root via newline injection in vpn username
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in NetworkManager-vpnc. This vulnerability allows a local unprivileged user to escalate privileges to root. By injecting a newline character into the VPN username field, an attacker can manipulate the vpnc configuration to execute an arbitrary program with root privileges when the 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
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-vpnc 0 ~ * -

II. Public POCs for CVE-2026-91840

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III. Intelligence Information for CVE-2026-91840

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Other References for CVE-2026-91840 (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-2026-91839 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 product: NetworkManager-vpnc
Same vendor: GNOME
Same weakness: CWE-93

V. Comments for CVE-2026-91840

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