{"id":"CVE-2026-21716","title":"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 pa…","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 pa…","severity":"low","cvss":3.3,"cvssVector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-862"],"vendor":"nodejs","product":"node.js","affected":["node.js <= 20.20.1","node.js >= 22.0.0, <= 22.22.1","node.js >= 24.0.0, <= 24.14.0","node.js >= 25.0.0, <= 25.8.1"],"published":"2026-03-30","updated":"2026-08-19","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-21716","references":[{"url":"https://nodejs.org/en/blog/vulnerability/march-2026-security-releases","label":"support@hackerone.com"}],"tags":["nvd"],"epss":0.00149,"epssPercentile":0.04473,"ingestedAt":"2026-08-19T13:39:32.895Z","slug":"CVE-2026-21716","body":"## Overview\n\nAn 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.\r\n\r\nAs 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.\r\n\r\nThis vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-write` is intentionally restricted.\n\n## Affected\n\n- `node.js <= 20.20.1`\n- `node.js >= 22.0.0, <= 22.22.1`\n- `node.js >= 24.0.0, <= 24.14.0`\n- `node.js >= 25.0.0, <= 25.8.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":18,"depthScoreParts":{"impact":18.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}