IBM Support

Security Bulletin: IBM Langflow Desktop Symlink Validation Bypass

Security Bulletin


Summary

tar-fs is used by IBM Langflow Desktop as part of its archive extraction and file handling functionality through Node.js dependencies. A vulnerability in tar-fs affects how symbolic links are validated during extraction, allowing a crafted tarball to bypass symlink protections when the destination directory is predictable. This could enable an attacker to perform path traversal and write files outside the intended directory, potentially impacting the integrity of IBM Langflow Desktop's filesystem and leading to unauthorized file modification.

Vulnerability Details

CVEID:   CVE-2025-59343
DESCRIPTION:   tar-fs provides filesystem bindings for tar-stream. Versions prior to 3.1.1, 2.1.3, and 1.16.5 are vulnerable to symlink validation bypass if the destination directory is predictable with a specific tarball. This issue has been patched in version 3.1.1, 2.1.4, and 1.16.6. A workaround involves using the ignore option on non files/directories.
CWE:   CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS Source:   security-advisories@github.com
CVSS Base score:   8.7
CVSS Vector:   (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)

Affected Products and Versions

Affected Product(s)Version(s)
IBM Langflow Desktop1.6.0 - 1.8.3

Remediation/Fixes

IBM recommends addressing the vulnerability now by upgrading to IBM Langflow Desktop 1.8.4 or newer https://www.langflow.org/blog/langflow-1-8-desktop

If you are already using Langflow Desktop, upgrade in the application to version 1.8.4

To install Langflow Desktop for the first time, visit Download Langflow Desktop.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Acknowledgement

Change History

02 Apr 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

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSWUKP1","label":"IBM Langflow Desktop"},"Component":"","Platform":[{"code":"PF033","label":"Windows"},{"code":"PF017","label":"Mac OS"}],"Version":"1.6.0 - 1.8.3","Edition":"","Line of Business":{"code":"LOB76","label":"Data Platform"}},{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSWUKP1","label":"IBM Langflow Desktop"},"Component":"","Platform":[{"code":"PF033","label":"Windows"},{"code":"PF017","label":"Mac OS"}],"Version":"1.6.0 - 1.8.3","Edition":"","Line of Business":{"code":"LOB76","label":"Data Platform"}}]

Document Information

Modified date:
02 April 2026

Initial Publish date:
02 April 2026

UID

ibm17268427