CVE-2026-44705: tmp: Path Traversal via unsanitized prefix/postfix enables directory escape

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-06-11 · updated 2026-10-26
Weakness: CWE-22

Description

tmp is a temporary file and directory creator for node.js. Prior to 0.2.6, the tmp npm package contains a path traversal vulnerability that allows escaping the intended temporary directory when untrusted data flows into the prefix, postfix, or dir options. By embedding traversal sequences (e.g., ../) or path separators in these parameters, attackers can cause files to be created outside the configured temporary base directory at attacker-controlled locations with the privileges of the running process. This vulnerability affects applications that pass user-controlled data to tmp's file/directory creation functions without proper input sanitization. This vulnerability is fixed in 0.2.6.

Affected products

raszi node-tmp: before 0.2.6 — fixed in 0.2.6
Npm Tmp: before 0.2.6 — fixed in 0.2.6

How to fix

Upgrade to a fixed version: raszi node-tmp 0.2.6; Npm Tmp 0.2.6. Check the vendor advisory for mitigations.

References

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