Node.js is vulnerable to Permission Model file-name disclosure via recursive fs.watch

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-123829
StatePUBLISHED
Assigneropenjs
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-11 19:17:32 UTC
Updated2026-11-11 19:17:32 UTC
DescriptionA Permission Model bypass in Node.js recursive file watching discloses the names of files and directories the process is not permitted to read. On macOS and Windows, fs.watch() and fs.promises.watch() in recursive mode are backed by the native libuv watcher: FSEventWrap::Start checks kFileSystemRead only once, on the watched root, and FSEventWrap::OnEvent then forwards every filename libuv reports (relative paths at any depth) to the JavaScript callback without checking that each path is covered by the read grant. Code running under --permission with an exact read grant on a directory can therefore learn names such as sub/secret.txt even though readdir on that subdirectory is denied. The flaw exposes names and timing metadata, not file contents, and requires macOS or Windows plus files created under the watched directory by another actor. This vulnerability affects Node.js 26.x, 24.x, and 22.x.

Risk And Classification

Primary CVSS: v3.0 2.5 LOW from ce714d77-add3-4f53-aff5-83d477b104bb

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Problem Types: CWE-200 | CWE-200 Information Disclosure

VersionSourceTypeScoreSeverityVector
3.0ce714d77-add3-4f53-aff5-83d477b104bbSecondary2.5LOWCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
3.0CNACVSS2.5LOWCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.0 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nodejs Node affected 0.0.0 22.23.5 semver Not specified
CNA Nodejs Node affected 23.0.0 24.22.3 semver Not specified
CNA Nodejs Node affected 25.0.0 26.13.1 semver Not specified

References

ReferenceSourceLinkTags
cna.openjsf.org/security-advisories.html ce714d77-add3-4f53-aff5-83d477b104bb cna.openjsf.org
nodejs.org/en/blog/vulnerability/november-2026-security-releases ce714d77-add3-4f53-aff5-83d477b104bb nodejs.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Trail of Bits (OpenAI) (en)

CNA: RafaelGSS (en)

CNA: UlisesGascon (en)

CNA: aduh95 (en)

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