CVE-2026-21716

State: Published
Severity: 3.3 Low
Published: Mar 30, 2026
Updated: Mar 31, 2026
Reserved: Jan 4, 2026

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.

Scores

CVSS	Score	Vector	Source
3.0	3.3 Low	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	hackerone

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
nodenodejs	20.20.1 through 20.20.1Affected 22.22.1 through 22.22.1Affected 24.14.0 through 24.14.0Affected 25.8.1 through 25.8.1Affected

References

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

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