Vulnerability Description
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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Raszi | Tmp | 0.2.6 |
Related Weaknesses (CWE)
References
- https://github.com/raszi/node-tmp/security/advisories/GHSA-7c78-jf6q-g5cmExploitMitigationVendor Advisory
- https://github.com/raszi/node-tmp/security/advisories/GHSA-7c78-jf6q-g5cmExploitMitigationVendor Advisory
FAQ
What is CVE-2026-49982?
CVE-2026-49982 is a vulnerability with a CVSS score of 8.2 (HIGH). 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, po...
How severe is CVE-2026-49982?
CVE-2026-49982 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-49982?
Check the references section above for vendor advisories and patch information. Affected products include: Raszi Tmp.