CVE-2026-18640
Velociraptor directory traversal via the NewNotebook API
Description
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.
INFO
Published Date :
Aug. 11, 2026, 4:17 p.m.
Last Modified :
Aug. 11, 2026, 4:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 9974b330-7714-4307-a722-5648477acda7 | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Validate and sanitize all notebook API parameters.
- Enforce strict output path validation.
- Prevent file writes outside the data store.
- Apply file extension restrictions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-18640.
| URL | Resource |
|---|---|
| http://docs.velociraptor.app/announcements/advisories/cve-2026-18640/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-18640 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-18640
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-18640 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-18640 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 11, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/Velocidex/velociraptor/', 'vendor': 'Rapid7', 'product': 'Velociraptor', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.77.2', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L Added CWE CWE-22 Added Reference http://docs.velociraptor.app/announcements/advisories/cve-2026-18640/