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VulnerabilityPublished

CVE-2026-21716: nodejs node · Missing Authorization

Affects nodejs nodeSource CVE Database V5

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Mentioned vulnerabilities

Not known to be exploited · CVSS 3.3 Low.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.0 base score
3.3Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
nodejsnodeAffected
  • >=20.20.1 <=20.20.1
  • >=22.22.1 <=22.22.1
  • >=24.14.0 <=24.14.0
  • >=25.8.1 <=25.8.1
Fixed in–
npmnodepkg:npm/nodeOther threatsAffected
  • 20.20.1 – 25.8.1
4 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should monitor Node.js vendor advisories for updates addressing this incomplete fix. Until a patch is available, avoid relying solely on the Permission Model's --allow-fs-write restrictions when using promise-based FileHandle methods.

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.

References

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