CVE Watchtower


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CVE-2026-21716NVD

Vulnerability Summary

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.
Severity Level
LOW(3.3)
Published Date
Mar 30, 2026
Last Modified
Apr 1, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.01%Probability
Root Weakness (CWE)
The software does not perform an authorization check when an actor attempts to access a resource or perform an action.
CVSS v3.0 Base Metrics
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone