CVE-2026-56847: A flaw in Node.js Permission Model enforcement allows `trace_events.createTracing().enable()` Writes Trace Logs Outside `--allow-fs-write`. This can lead to confidentiality impact or bypass of the intended security boundary under affected configurations. This vulnerability affects Node.js **22.x**, **24.x**, and **26.x**.
CVE-2026-56847 is a vulnerability in A flaw in Node.js Permission Model enforcement allows `trace_events.createTracing().enable()` Writes Trace Logs Outside `--allow-fs-write`. This can lead to confidentiality impact or bypass of the intended security boundary under affected configurations. This vulnerability affects Node.js **22.x**, **24.x**, and **26.x**., rated Low by Microsoft, with a CVSS 3.1 base score of 3.3 (Low). An attacker can exploit it by an attacker with local access, with low privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.20% probability of exploitation activity in the next 30 days, higher than 10% of all scored vulnerabilities. Microsoft released the fix on 6 August 2026, outside Patch Tuesday. It affects 1 product in 1 product family (Open Source Software).
Key facts
- CVE ID
- CVE-2026-56847
- Severity
- Low CVSS 3.3
- Microsoft severity
- Low
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-1119
- EPSS
- 0.20% (percentile 10%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- July 2026 Patch Tuesday
- Product families
- Open Source Software
CVSS score and vector
Microsoft scores CVE-2026-56847 at 3.3 (temporal 3.3) using CVSS 3.1. Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
| Metric | Value |
|---|---|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | None |
| Integrity impact | Low |
| Availability impact | None |
NVD scores it 6.1 (MEDIUM) with CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
Affected products (1)
Open Source Software
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| azl3 nodejs 24.17.0-1 on Azure Linux 3.0 | CBL-Mariner Releases | Security Update | 24.18.1-1 | No |
Exploitation and detection
Detection and weaponization
Weaponization maturity: Exploit.
Proof-of-concept repositories (1)
NIST NVD data
- NVD status
- Analyzed
- NVD CVSS
- 6.1 (MEDIUM)
- NVD weakness
- CWE-1119
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| node.js | from 22.0, up to and including 22.23.1 |
| node.js | from 24.0.0, up to and including 24.18.0 |
| node.js | from 26.0.0, up to and including 26.5.0 |
References
- https://nodejs.org/en/blog/vulnerability/july-2026-security-releases (Vendor Advisory)
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |