Vulnerability details
CVE-2026-91840
GNOME NetworkManager-vpnc
Networkmanager-vpnc: networkmanager-vpnc: local privilege escalation to root via newline injection in vpn username
CVSS 3.1
7.8High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (fedora) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| GNOME | NetworkManager-vpnc | All | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://access.redhat.com/security/cve/CVE-2026-91840 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2533642 issue-trackingx_refsource_REDHAT
- https://gitlab.gnome.org/Archive/NetworkManager-vpnc/-/work_items/19
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Details
- Published
- 2026-09-25
- Last updated
- 2026-09-28
- State
- Published
- Assigner (CNA)
- fedora
Exploit prediction (EPSS)
0.19%
Probability of exploitation in 30 days
9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')