AUGUST 4, 2026
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Case File

CVE-2026-21716

LOW · CVSS 3.3 EPSS 0.16%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2026-03-30 · Last synced 2026-08-04

CyberRota Analysis

This is a low severity vulnerability with a CVSS score of 3.3. See the original NVD description below for full technical details.

CVE
CVE-2026-21716
Severity
LOW
CVSS
3.3
EPSS
0.16%

Original NVD 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.