CVE-2026-21716

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 packages (4)

• Alpine/nodejsfrom 0, < 22.22.2-r0
• Bitnami/nodefrom 0, < 20.20.2, >= 21.0.0, < 22.22.2, >= 23.0.0, < 24.14.1, >= 25.0.0, < 25.8.2
• Bitnami/node-minfrom 0, < 20.20.2, >= 21.0.0, < 22.22.2, >= 23.0.0, < 24.14.1, >= 25.0.0, < 25.8.2
• Debian/nodejsfrom 0, < 20.19.2+dfsg-1+deb13u2

CVSS scores

References (4)

• ADVISORYhttps://security.alpinelinux.org/vuln/CVE-2026-21716
• ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-21716
• WEBhttps://nodejs.org/en/blog/vulnerability/march-2026-security-releases
• WEBhttps://nvd.nist.gov/vuln/detail/CVE-2026-21716