CVE-2026-49982

tmp is a temporary file and directory creator for node.js. In version 0.2.6, the _assertPath guard added to tmp rejects only string values that contain the substring ... It is bypassed when prefix, postfix, or template is supplied as a non-string value (Array, Buffer, or any object) whose includes('..') returns falsy but whose stringification still contains ../. The value flows through Array.prototype.join/String coercion inside _generateTmpName and path.join(tmpDir, opts.dir, name), producing a final path that escapes tmpdir and creates a file or directory at an attacker-controlled location with the host process's privileges. This affects any application that forwards untrusted request data (a common pattern is JSON body fields or qs-parsed bracket-array query strings such as ?prefix[]=...) into tmp.file, tmp.fileSync, tmp.dir, tmp.dirSync, tmp.tmpName, or tmp.tmpNameSync without explicit type coercion. This vulnerability is fixed in 0.2.7.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/raszi/node-tmp/security/advisories/GHSA-7c78-jf6q-g5cm	Exploit Mitigation Vendor Advisory
https://github.com/raszi/node-tmp/security/advisories/GHSA-7c78-jf6q-g5cm	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:raszi:tmp:0.2.6:*:*:*:*:node.js:*:*

History

No history.

Information

Published : 2026-06-11 17:16

Updated : 2026-06-17 10:55

NVD link : CVE-2026-49982

Mitre link : CVE-2026-49982

CVE.ORG link : CVE-2026-49982

JSON object : View

Products Affected

raszi

tmp

CWE

CWE-20

Improper Input Validation

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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