Vulnerability-Lookup

GHSA-P2G6-FFCC-PQQV

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

Details

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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-91840"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-93"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-25T18:17:32Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-p2g6-ffcc-pqqv",
  "modified": "2026-09-25T18:31:29Z",
  "published": "2026-09-25T18:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91840"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-91840"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533642"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.gnome.org/Archive/NetworkManager-vpnc/-/work_items/19"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-09-25 17:56 – Updated: 2026-09-26 03:55

Title

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

Summary

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: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-25 00:00 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
GNOME	NetworkManager-vpnc	Affected: 0 , < * (semver)

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

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  "containers": {
    "adp": [
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-91840",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-25T00:00:00+00:00",
                "version": "2.0.3"
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            }
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        "providerMetadata": {
          "dateUpdated": "2026-09-26T03:55:52.959Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            "tags": [
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    ],
    "cna": {
      "affected": [
        {
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          "value": "Red Hat would like to thank Andreas Gabriel Berbescu for reporting this issue."
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      "descriptions": [
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          "lang": "en",
          "value": "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."
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          "other": {
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            "type": "Red Hat severity rating"
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            "userInteraction": "NONE",
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      "workarounds": [
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          "lang": "en",
          "value": "If vpnc VPN connections are not required, the NetworkManager-vpnc package can be removed to eliminate the vulnerability. This action will prevent the system from establishing vpnc-based VPN connections.\n\nTo remove the package, execute the following command as root:\n`# dnf remove NetworkManager-vpnc`\n\nNote that removing this package may impact functionality if vpnc VPNs are actively used."
        }
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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.

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GHSA-P2G6-FFCC-PQQV

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

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