Vulnerability-Lookup

CVE-2026-91840 (GCVE-0-2026-91840)

Vulnerability from cvelistv5 – Published: 2026-09-25 17:56 – Updated: 2026-09-25 18:15

Title

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

Summary

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.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-25 18:14 UTC

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Assigner

fedora redhat root

References

3 references

URL	Tags
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-v…

Impacted products

1 product

Vendor	Product	Version	CPE status
GNOME	NetworkManager-vpnc	Affected: 0 , < * (semver)	guessed

Date Public

2026-09-15 09:50

Credits

Red Hat would like to thank Andreas Gabriel Berbescu for reporting this issue.

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-91840

Vulnerability from fkie_nvd - Published: 2026-09-25 18:17 - Updated: 2026-09-25 19:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	patrick@puiterwijk.org	https://access.redhat.com/security/cve/CVE-2026-91840
	patrick@puiterwijk.org	https://bugzilla.redhat.com/show_bug.cgi?id=2533642
	patrick@puiterwijk.org	https://gitlab.gnome.org/Archive/NetworkManager-vpnc/-/work_items/19
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://gitlab.gnome.org/Archive/NetworkManager-vpnc/-/work_items/19

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-P2G6-FFCC-PQQV

Vulnerability from github – Published: 2026-09-25 18:31 – Updated: 2026-09-25 18:31

Details

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

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  "modified": "2026-09-25T18:31:29Z",
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}

UBUNTU-CVE-2026-91840 (CVE-2026-91840)

Vulnerability from osv_ubuntu – Published: 2026-09-17 00:00 – Updated: 2026-09-17 00:00 – Source website

Details

[username newline injection reaches a root password helper]

Severity

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-91840	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-91840	REPORT
	https://gitlab.gnome.org/Archive/NetworkManager-v…	REPORT
	https://blogs.gnome.org/mcatanzaro/2026/09/15/pri…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-vpnc",
            "binary_version": "1.1.93-1ubuntu0.1"
          },
          {
            "binary_name": "network-manager-vpnc-gnome",
            "binary_version": "1.1.93-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "network-manager-vpnc",
        "purl": "pkg:deb/ubuntu/network-manager-vpnc@1.1.93-1ubuntu0.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.10.0-1ubuntu1",
        "1.0.8-1ubuntu1",
        "1.1.93-1",
        "1.1.93-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-vpnc",
            "binary_version": "1.2.4-6ubuntu0.1"
          },
          {
            "binary_name": "network-manager-vpnc-gnome",
            "binary_version": "1.2.4-6ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "network-manager-vpnc",
        "purl": "pkg:deb/ubuntu/network-manager-vpnc@1.2.4-6ubuntu0.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.4-4",
        "1.2.4-6",
        "1.2.4-6ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-vpnc",
            "binary_version": "1.2.6-2"
          },
          {
            "binary_name": "network-manager-vpnc-gnome",
            "binary_version": "1.2.6-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "network-manager-vpnc",
        "purl": "pkg:deb/ubuntu/network-manager-vpnc@1.2.6-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.6-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-vpnc",
            "binary_version": "1.2.8-2"
          },
          {
            "binary_name": "network-manager-vpnc-gnome",
            "binary_version": "1.2.8-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "network-manager-vpnc",
        "purl": "pkg:deb/ubuntu/network-manager-vpnc@1.2.8-2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.6-3",
        "1.2.6-4",
        "1.2.8-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-vpnc",
            "binary_version": "1.2.8-7build2"
          },
          {
            "binary_name": "network-manager-vpnc-gnome",
            "binary_version": "1.2.8-7build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "network-manager-vpnc",
        "purl": "pkg:deb/ubuntu/network-manager-vpnc@1.2.8-7build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.8-5",
        "1.2.8-7",
        "1.2.8-7build1",
        "1.2.8-7build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "network-manager-vpnc",
            "binary_version": "1.4.0-3build1"
          },
          {
            "binary_name": "network-manager-vpnc-gnome",
            "binary_version": "1.4.0-3build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "network-manager-vpnc",
        "purl": "pkg:deb/ubuntu/network-manager-vpnc@1.4.0-3build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.0-3",
        "1.4.0-3build1"
      ]
    }
  ],
  "aliases": [],
  "details": "[username newline injection reaches a root password helper]",
  "id": "UBUNTU-CVE-2026-91840",
  "modified": "2026-09-17T00:00:00Z",
  "published": "2026-09-17T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-91840"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-91840"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.gnome.org/Archive/NetworkManager-vpnc/-/work_items/19"
    },
    {
      "type": "REPORT",
      "url": "https://blogs.gnome.org/mcatanzaro/2026/09/15/privilege-escalation-vulnerabilities-in-networkmanager-plugins/"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-91840"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-91840 (GCVE-0-2026-91840)

FKIE_CVE-2026-91840

GHSA-P2G6-FFCC-PQQV

UBUNTU-CVE-2026-91840 (CVE-2026-91840)

Tags

Sightings

Nomenclature

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