Low severity · published Mar 30, 2026
CVE-2026-21715
A flaw in Node.js Permission Model filesystem enforcement leaves `fs.realpathSync.native()` without the required read permission checks, while all comparable filesystem functions…
3.3
CVSS
0.2%
EPSS
No
On KEV
Description
A flaw in Node.js Permission Model filesystem enforcement leaves `fs.realpathSync.native()` without the required read permission checks, while all comparable filesystem functions correctly enforce them.
As a result, code running under `--permission` with restricted `--allow-fs-read` can still use `fs.realpathSync.native()` to check file existence, resolve symlink targets, and enumerate filesystem paths outside of permitted directories.
This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-read` is intentionally restricted.
CVSS vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
node · nodejs
20.20.1 through 20.20.1; 22.22.1 through 22.22.1; 24.14.0 through 24.14.0; 25.8.1 through 25.8.1; 4.0 before 4.*; 5.0 before 5.*; +14 more · source: vendor
NO
Node.js · Nodejs
through 20.20.1; 22.0.0 through 22.22.1; 24.0.0 through 24.14.0; 25.0.0 through 25.8.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21715
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21715
Vendor Advisory
https://nodejs.org/en/blog/vulnerability/march-2026-security-releases
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