CVE-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 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.
- Score
- CVSS 3.0 3.3 Low
- Status
- Analyzed - support@hackerone.com
- Published
- 2026-03-30
- Last modified
- 2026-03-31
- Weaknesses
- CWE-862
Affected products
References
- https://nodejs.org/en/blog/vulnerability/march-2026-security-releases
