Node.js Tar Package Vulnerability Allows File Overwrite Outside Directory
CVE-2026-29786

8.2HIGH

Key Information:

Vendor

Isaacs

Status
Node-tar
Vendor
CVE Published:
7 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-29786?

The node-tar package for Node.js has a vulnerability that allows an attacker to create a hardlink pointing outside of the designated extraction directory. This occurs when a drive-relative link target is used, such as C:../target.txt, potentially leading to unintended file overwrites outside the current working directory during the normal tar.x() extraction process. This issue has been resolved in version 7.5.10 of the node-tar package.

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Affected Version(s)

node-tar < 7.5.10

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-29786
Created by Jvr2022

References

https://github.com/isaacs/node-tar/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/isaacs/node-tar/commit/7bc755dd85e623c...
x_refsource_MISC

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability Reserved

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