CVE-2026-21716_CVE-2026-21716

3.3 / 10

LOW

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

Description

An incomplete fix for CVE-2024-36137 leaves `FileHandle.chmod()` and `FileHandle.chown()` in the promises API without the required permission checks, while their callback-based equivalents (`fs.fchmod()`, `fs.fchown()`) were correctly patched.

As a result, code running under `--permission` with restricted `--allow-fs-write` can still use promise-based `FileHandle` methods to modify file permissions and ownership on already-open file descriptors, bypassing the intended write restrictions.

This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-write` is intentionally restricted.

Basic Information

ID CVE-2026-21716

Source hackerone

Published Mar 30, 2026 at 19:07

Modified Mar 31, 2026 at 14:27

Affected Product

Vendor nodejs

Product node

Version 20.20.1

Affected Versions nodejs node 20.20.1
nodejs node 22.22.1
nodejs node 24.14.0
nodejs node 25.8.1

CWE Classification

CWE-862

References

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

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