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CVE-2026-21716

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CVE-2026-21716

Published: Mar 30, 2026

Modified: Mar 31, 2026

PUBLISHED

CVSS v3.0

3.3

LOW

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.

VendorProductVersions

nodejs

node

affected
20.20.1 - <= 20.20.1
affected
22.22.1 - <= 22.22.1
affected
24.14.0 - <= 24.14.0
affected
25.8.1 - <= 25.8.1

CVSS v3.0 Details

CVSS v3.0 Vector

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

References

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