Vulnerability in Node.js Node
CVE-2026-21715
A flaw in Node.js Permission Model filesystem enforcement leaves `fs.realpathSync.native()` without the required read permission checks, while all comparable filesystem functions correctly enforce them. As a result, code running under `--permission` with restricted `--allow-fs-read` can still use `fs.realpathSync.native()` to check file existence, resolve symlink targets, and enumerate filesystem paths outside of permitted directories. This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-read` is intentionally restricted.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (4.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Node.js Node — versions 20.20.1, 22.22.1, 24.14.0
- Node.js
Weakness classification (CWE)
References
- nodejs.org/en/blog/vulnerability/march-2026-security-releases (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-21715?
- CVE-2026-21715 is a low-severity vulnerability in Node.js Node, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 3.3/10. Published 2026-03-30.
- How severe is CVE-2026-21715?
- Low severity. CVSS v3 base score is 3.3 out of 10.