Vulnerability-Lookup

GHSA-4533-C5F5-J3H9

Vulnerability from github – Published: 2026-09-14 21:31 – Updated: 2026-09-14 21:31

Details

A flaw was found in NetworkManager-l2tp. The plugin writes attacker-controlled VPN connection properties (vpn.data and vpn.secrets values) unescaped into a generated ipsec.conf file that pluto loads as root. A local unprivileged user can create and activate their own L2TP VPN profile containing a newline-injected leftupdown directive; pluto executes that command as root when the IKE security association is established, resulting in local privilege escalation. This is the same bug class as CVE-2018-10900 (NetworkManager-vpnc).

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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{
  "affected": [],
  "aliases": [
    "CVE-2026-19624"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-88"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-14T20:16:43Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in NetworkManager-l2tp. The plugin writes attacker-controlled VPN connection properties (vpn.data and vpn.secrets values) unescaped into a generated ipsec.conf file that pluto loads as root. A local unprivileged user can create and activate their own L2TP VPN profile containing a newline-injected leftupdown directive; pluto executes that command as root when the IKE security association is established, resulting in local privilege escalation. This is the same bug class as CVE-2018-10900 (NetworkManager-vpnc).",
  "id": "GHSA-4533-c5f5-j3h9",
  "modified": "2026-09-14T21:31:45Z",
  "published": "2026-09-14T21:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19624"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/commit/3704d8c9d5e5f9ed1626a8ce7627a04247cea673"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/commit/95b6b46f48a0c9eabc79272cd313f219110ef91c"
    },
    {
      "type": "WEB",
      "url": "https://bodhi.fedoraproject.org/updates/?packages=NetworkManager-l2tp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nm-l2tp/NetworkManager-l2tp/releases"
    },
    {
      "type": "WEB",
      "url": "https://linnemanlabs.com/posts/nm-l2tp-newline-to-root"
    }
  ],
  "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-2026-19624 (GCVE-0-2026-19624)

Vulnerability from cvelistv5 – Published: 2026-09-14 19:19 – Updated: 2026-09-14 19:43

Title

NetworkManager-l2tp: local privilege escalation via ipsec.conf injection

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 2026-09-14 19:43 UTC

CWE

CWE-88 - Improper Control of an Argument of a Program Call ('Argument Injection')

Assigner

fedora redhat root

References

5 references

URL	Tags
https://github.com/nm-l2tp/NetworkManager-l2tp/co…	patch
https://github.com/nm-l2tp/NetworkManager-l2tp/co…	patch
https://github.com/nm-l2tp/NetworkManager-l2tp/releases	release-notes
https://bodhi.fedoraproject.org/updates/?packages…	vendor-advisory
https://linnemanlabs.com/posts/nm-l2tp-newline-to-root/	third-party-advisory

Impacted products

3 products

Vendor	Product	Version
		Affected: 1.0.0 , < 1.0.16 (semver) Affected: 1.2.0 , < 1.2.22 (semver) Affected: 1.8.0 , < 1.8.10 (semver) Affected: 1.20.0 , < 1.20.24 (semver) Affected: 1.52.0 , < 1.52.4 (semver)
Fedora	Fedora	Affected: 1.52.0 , < 1.52.4 (semver)
Fedora	Extra Packages for Enterprise Linux (EPEL)	Affected: 1.20.0 , < 1.20.24 (semver)

Date Public

2026-09-03 00:00

Credits

Keith Linneman (Linneman Labs)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-19624",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-14T19:43:22.928124Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-14T19:43:32.531Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/nm-l2tp/NetworkManager-l2tp",
          "defaultStatus": "unaffected",
          "packageName": "NetworkManager-l2tp",
          "versions": [
            {
              "lessThan": "1.0.16",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "semver"
            },
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              "status": "affected",
              "version": "1.2.0",
              "versionType": "semver"
            },
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              "version": "1.8.0",
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            },
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              "status": "affected",
              "version": "1.52.0",
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            }
          ]
        },
        {
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            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
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          "url": "https://bodhi.fedoraproject.org/updates/?packages=NetworkManager-l2tp"
        },
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          "url": "https://linnemanlabs.com/posts/nm-l2tp-newline-to-root/"
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    "assignerShortName": "fedora",
    "cveId": "CVE-2026-19624",
    "datePublished": "2026-09-14T19:19:43.736Z",
    "dateReserved": "2026-08-12T14:50:47.790Z",
    "dateUpdated": "2026-09-14T19:43:32.531Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

GHSA-4533-C5F5-J3H9

CVE-2026-19624 (GCVE-0-2026-19624)

Tags

Sightings

Nomenclature