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Velociraptor directory traversal via the NewNotebook API

Type: advisorySources: OSV

The NewNotebook API does not sufficiently sanitize its parameters allowing an authenticated user with NOTEBOOK_EDIT permission to write the notebook record outside the org's data store directory. The file written must have an extension of ".json.db" but can otherwise overwrite other metadata files (such as ACL records, hunts etc). This can corrupt these files and cause data corruption.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-18640
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 19:55 UTC · Revision 1

Source evidence

Velociraptor directory traversal via the NewNotebook API

core-osv · Original source

Published 11 Aug 2026, 14:53 UTC

The NewNotebook API does not sufficiently sanitize its parameters allowing an authenticated user with NOTEBOOK_EDIT permission to write the notebook record outside the org's data store directory. The file written must have an extension of ".json.db" but can otherwise overwrite other metadata files (such as ACL records, hunts etc). This can corrupt these files and cause data corruption.

osv:CVE-2026-18640
Complete source record
{
  "id": "5857b5269fd0b73f7d21ba2fe5af688b98ca427c7faee2ecd5a3bb54794dd8d7",
  "url": "https://osv.dev/vulnerability/CVE-2026-18640",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Velociraptor directory traversal via the NewNotebook API",
    "summary": "The NewNotebook API does not sufficiently sanitize its parameters allowing an authenticated user with NOTEBOOK_EDIT permission to write the notebook record outside the org's data store directory. The file written must have an extension of \".json.db\" but can otherwise overwrite other metadata files (such as ACL records, hunts etc). This can corrupt these files and cause data corruption.",
    "evidence": "osv:CVE-2026-18640",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-18640",
      "aliases": [
        "CVE-2026-18640"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/velocidex/velociraptor",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c0c9dd609140139efcb37c47e2afa79ed57e6c84"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.77.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.77.1",
            "v0.77.1-rc1",
            "v0.76.1-rc1",
            "v0.75",
            "v0.74",
            "v0.73",
            "v0.72",
            "v0.7.0",
            "v0.7.0-rc1",
            "v0.6.8-rc1",
            "v0.6.7-rc1",
            "v0.6.4-rc1",
            "v0.6.3-rc1",
            "v0.6.2-rc1",
            "v0.6.1-rc1",
            "v0.6.0-rc1",
            "v0.5.9-rc1",
            "v0.5.8-rc1",
            "v0.5.7",
            "v0.5.6",
            "v0.5.5-1",
            "v0.5.5",
            "v0.5.4",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.9",
            "v0.4.8",
            "v0.4.7",
            "v0.4.6",
            "v0.4.5",
            "v0.4.4",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.9",
            "v0.3.8",
            "v0.3.7",
            "v0.3.6",
            "v0.3.5",
            "v0.3.4",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "0.2.9",
            "0.2.8",
            "0.2.7",
            "0.2.6",
            "0.2.5",
            "0.2.4",
            "0.2.3",
            "0.2.2",
            "0.2.1",
            "v0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18640.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.956834853Z",
      "provider": "osv",
      "references": [
        "https://github.com/Velocidex/velociraptor/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18640.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-18640"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "rapid7",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18640.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-18640",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 506408,
  "published_at": "2026-08-11T14:53:18.791+00:00"
}