CVE-2026-58043: A flaw in Node.js Permission Model enforcement can over-grant filesystem access across radix-tree prefix boundaries. Under `--permission`, an attacker who is granted access to one path can abuse boundary handling to read from or write to paths outside the intended filesystem allowlist. This vulnerability affects Node.js **main**, **22.x**, **24.x**, and **26.x**.
CVE-2026-58043 is a vulnerability in A flaw in Node.js Permission Model enforcement can over-grant filesystem access across radix-tree prefix boundaries. Under `--permission`, an attacker who is granted access to one path can abuse boundary handling to read from or write to paths outside the intended filesystem allowlist. This vulnerability affects Node.js **main**, **22.x**, **24.x**, and **26.x**., rated Important by Microsoft, with a CVSS 3.1 base score of 7.5 (High). 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 0.22% probability of exploitation activity in the next 30 days, higher than 13% 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-2026-58043
- Severity
- High CVSS 7.5
- Microsoft severity
- Important
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-284
- EPSS
- 0.22% (percentile 13%)
- 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-2026-58043 at 7.5 (temporal 7.5) using CVSS 3.1. Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
| Metric | Value |
|---|---|
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Changed |
| Confidentiality impact | High |
| Integrity impact | High |
| Availability impact | None |
NVD scores it 8.4 (HIGH) with CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/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
- 8.4 (HIGH)
- NVD weakness
- CWE-284
- 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. |