CVE-2026-21716
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| nodejs | node | 20.20.1 <= 20.20.1 | affected |
| nodejs | node | 22.22.1 <= 22.22.1 | affected |
| nodejs | node | 24.14.0 <= 24.14.0 | affected |
| nodejs | node | 25.8.1 <= 25.8.1 | affected |
Weaknesses
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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