7.8

CVE-2026-91840: gnome networkmanager-vpnc CRLF Injection

CVSS: 7.8v3.1HighDeferred
AliasesUBUNTU-CVE-2026-91840DEBIAN-CVE-2026-91840
Published 25-09-2026Last modified 28-09-2026
Open JSON

Vulnerability summary

CVE-2026-91840 is a high (CVSS 7.8) CRLF Injection vulnerability in gnome networkmanager-vpnc. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.4% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.19%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 25-09-2026
    PublishedVulnerability first disclosed.
  2. 28-09-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

26-09-202619-10-2026
EPSS score
0.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • network-manager-vpncAll versions (No fix recorded)
Gnome1 product
Ubuntu1 product
  • network-manager-vpncAll versions (No fix recorded)

3 vendors · 3 products

References

7 links