| Name | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6183-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| nodejs (PTS) | bullseye | 12.22.12~dfsg-1~deb11u4 | fixed |
| bullseye (security) | 12.22.12~dfsg-1~deb11u7 | fixed | |
| bookworm, bookworm (security) | 18.20.4+dfsg-1~deb12u1 | fixed | |
| trixie | 20.19.2+dfsg-1 | vulnerable | |
| trixie (security) | 20.19.2+dfsg-1+deb13u2 | fixed | |
| forky | 22.22.2+dfsg+~cs22.19.15-3 | fixed | |
| sid | 24.15.0+dfsg+~cs24.12.2-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| nodejs | source | bullseye | (not affected) | |||
| nodejs | source | bookworm | (not affected) | |||
| nodejs | source | trixie | 20.19.2+dfsg-1+deb13u2 | DSA-6183-1 | ||
| nodejs | source | (unstable) | 22.22.2+dfsg+~cs22.19.15-1 |
[bookworm] - nodejs <not-affected> (Feature was introduced in nodeJS 20)
[bullseye] - nodejs <not-affected> (Feature was introduced in nodeJS 20)
https://nodejs.org/en/blog/vulnerability/march-2026-security-releases#cve-2024-36137-patch-bypass---filehandlechmodchown-cve-2026-21716---low
Fixed by: https://github.com/nodejs/node/commit/012330956669e06864a674917de352d2d69ff51c (v20.20.2)
Feature introduced in 20 see https://nodejs.org/en/blog/announcements/v20-release-announce
Documentation of the flag: https://nodejs.org/api/cli.html#--experimental-permission (Added in v20.0.0)