CVE-2026-21715 — LOW (3.3) — White Hats Nepal

Vulnerability 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.

CVSS Score

3.3

LOW

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

NONE

Availability

NONE

Related Weaknesses (CWE)

CWE-732

References

https://nodejs.org/en/blog/vulnerability/march-2026-security-releases

FAQ

What is CVE-2026-21715?

CVE-2026-21715 is a vulnerability with a CVSS score of 3.3 (LOW). 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 the...

How severe is CVE-2026-21715?

CVE-2026-21715 has been rated LOW with a CVSS base score of 3.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-21715?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.