CVE-2026-21716 - GitHub Advisory Database (original) (raw)

1. GitHub Advisory Database
2. Unreviewed
3. CVE-2026-21716

An incomplete fix for CVE-2024-36137 leaves `FileHandle...

Low severity Unreviewed PublishedMar 30, 2026 to the GitHub Advisory Database • Updated Mar 31, 2026

Package

Affected versions

Unknown

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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-21716
• https://nodejs.org/en/blog/vulnerability/march-2026-security-releases

Published to the GitHub Advisory Database

Mar 30, 2026

Last updated

Mar 31, 2026