CVE-2026-21716
published 2026-03-30CVE-2026-21716: An incomplete fix for CVE-2024-36137 leaves `FileHandle.chmod()` and `FileHandle.chown()` in the promises API without the required permission checks, while…
low3.3CVSS 3.0
AVLACLPRLUINSUCNILAN
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | nodejs | < nodejs 22.22.2+dfsg+~cs22.19.15-1 (forky) | nodejs 22.22.2+dfsg+~cs22.19.15-1 (forky) |
| nodejs | nodejs | >= 0 < 22.22.2-r0 | 22.22.2-r0 |
| nodejs | nodejs | >= 0 < 22.22.2-r0 | 22.22.2-r0 |
| nodejs | nodejs | >= 0 < 24.14.1-r0 | 24.14.1-r0 |
| nodejs | nodejs | >= 0 < 20.19.2+dfsg-1+deb13u2 | 20.19.2+dfsg-1+deb13u2 |
| nodejs | nodejs | >= 0 < 22.22.2+dfsg+~cs22.19.15-1 | 22.22.2+dfsg+~cs22.19.15-1 |
CVSS provenance
nvdv3.03.3LOWCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
osv3.3LOW