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Security Bulletin: Vulnerability in node-tar bundled with IBM Fusion, IBM Fusion HCI, and IBM Fusion Content-Aware Storage

Security Bulletin


Summary

IBM Fusion, IBM Fusion HCI, and IBM Fusion Content-Aware Storage include the node-tar library, which is susceptible to a Path Traversal vulnerability during archive extraction. When default configurations are used, an attacker-controlled archive can create a hardlink inside the extraction directory that resolves to an arbitrary file path outside the intended extraction root directory. A remote attacker could exploit this flaw by convincing a user to extract a maliciously crafted Tar archive, allowing them to bypass built-in path protections to read and write arbitrary files on the local filesystem with the privileges of the extracting user. (CVE-2026-26960).

Vulnerability Details

CVEID:   CVE-2026-26960
DESCRIPTION:   node-tar is a full-featured Tar for Node.js. When using default options in versions 7.5.7 and below, an attacker-controlled archive can create a hardlink inside the extraction directory that points to a file outside the extraction root, enabling arbitrary file read and write as the extracting user. Severity is high because the primitive bypasses path protections and turns archive extraction into a direct filesystem access primitive. This issue has been fixed in version 7.5.8.
CWE:   CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS Source:   NVD
CVSS Base score:   7.1
CVSS Vector:   (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N)

Affected Products and Versions

Affected Product(s)Version(s)
IBM Fusion2.9.0 - 2.12.2
IBM Fusion HCI2.10.0 - 2.12.2
Content-Aware Storage1.0.0 - 1.1.4

Remediation/Fixes

IBM strongly recommends addressing the vulnerabilities now.

Product(s)Remediation/Fix/Instructions
IBM FusionUpgrade to version 2.13.0. See README for instructions.
IBM Fusion HCIUpgrade to version 2.13.0. See README for instructions.
Content-Aware StorageUpgrade to version 1.1.5. See Upgrading Content-Aware Storage

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Acknowledgement

Change History

09 Jul 2026: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location

Worldwide

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Document Information

Modified date:
09 July 2026

Initial Publish date:
09 July 2026

UID

ibm17279519