PT-2026-48678 · Raszi · Node-Tmp

Published

2026-06-11

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Updated

2026-06-11

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CVE-2026-49982

CVSS v3.1

8.2

High

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
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.

Exploit

Fix

Path traversal

RCE

Weakness Enumeration

CWE-22CWE-20

Related Identifiers

CVE-2026-49982

Affected Products

Node-Tmp