LOW 3.3 Microsoft
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.
Microsoft Security Update 2026-Mar: 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.
Affected Products
- azl3 nodejs 20.14.0-14 on Azure Linux 3.0
- azl3 nodejs24 24.13.0-3 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21715
- https://nvd.nist.gov/vuln/detail/CVE-2026-21715
This low severity vulnerability with a CVSS score of 3.3 was published on 2026-03-10 via Microsoft. Affected: azl3 nodejs 20.14.0-14 on Azure Linux 3.0, azl3 nodejs24 24.13.0-3 on Azure Linux 3.0.
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