CVE-2026-21715
Last modified
CVE-2026-21715 is a low-severity vulnerability rated 3.3/10 on the CVSS scale. 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.. EPSS estimates a 0.16% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nodejs | Node.Js | <= 20.20.1 |
| Nodejs | Node.Js | >= 22.0.0, <= 22.22.1 |
| Nodejs | Node.Js | >= 24.0.0, <= 24.14.0 |
| Nodejs | Node.Js | >= 25.0.0, <= 25.8.1 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
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