What’s Vulnerable › Vulnerabilities
CVE-2026-21716
- Severity: low (CVSS 3.3 v3.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-30 · updated 2026-08-19
- Weakness: CWE-862
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.
Affected products
- Node.js: through 20.20.1; from 22.0.0 through 22.22.1; from 24.0.0 through 24.14.0; from 25.0.0 through 25.8.1
References
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