CVE-2026-21716 - Microsoft Node.js FileHandle Permission Bypass Vulnerability

CVE-2026-21716 - Microsoft Node.js FileHandle Permission Bypass Vulnerability

https://cvefeed.io/rssfeed/latest.atom / Tue, 03/31/2026 - 00:09
CVE ID :CVE-2026-21716
Published : March 30, 2026, 8:16 p.m. | 49 minutes ago
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.
Severity: 3.3 | LOW
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