p PatchFirst

CVE-2026-49982

CVE-2026-49982 · tmp: Type-confusion bypass of _assertPath in [email protected] allows path traversal via non-string prefix/postfix/template

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 8.2 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • node-tmp

    Versions
    • 0.2.6: Affected

    No fix published

  • tmp npm

    Affected ranges
    • SEMVER: ≥ 0.2.6, < 0.2.7

    Update to 0.2.7

  • node-tmp Ubuntu:16.04:LTS

    Versions
    • 0.0.25-1
    • 0.0.28-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-tmp Ubuntu:18.04:LTS

    Versions
    • 0.0.31-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-tmp Ubuntu:20.04:LTS

    Versions
    • 0.0.33+dfsg-2
    • 0.1.0+dfsg-2
    • 0.1.0+dfsg-3
    • 0.1.0+dfsg-6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-tmp Ubuntu:22.04:LTS

    Versions
    • 0.2.1+dfsg-1
    • 0.2.1+dfsg-2
    • 0.2.1+dfsg+~0.2.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-tmp Ubuntu:24.04:LTS

    Versions
    • 0.2.2+dfsg+~0.2.3-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-tmp Ubuntu:25.10

    Versions
    • 0.2.2+dfsg+~0.2.3-1
    • 0.2.2+dfsg+~0.2.3-1.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-tmp Ubuntu:26.10

    Versions
    • 0.2.5+dfsg+~0.2.6-2
    • 0.2.7+dfsg+~0.2.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-tmp Ubuntu:26.04:LTS

    Versions
    • 0.2.2+dfsg+~0.2.3-1.1
    • 0.2.5+dfsg+~0.2.6-1
    • 0.2.5+dfsg+~0.2.6-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

Check your server →