UNIX symbolic link following in Langflow - CVE-2026-55447
Published: June 19, 2026
Vulnerability identifier: #VU134973
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-55447
CWE-ID: CWE-61
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Langflow
Affected software:
Langflow
Langflow
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information and execute arbitrary code.
The vulnerability exists due to UNIX symbolic link following in BaseFileComponent._unpack_bundle in BaseFileComponent-based nodes when processing a user-supplied tar archive. A remote attacker can upload a crafted tar archive containing symlinks to disclose sensitive information and execute arbitrary code.
User interaction is required to ingest the crafted file, and code execution requires a subsequent authentication bypass chain using a disclosed JWT signing secret.
How to mitigate CVE-2026-55447
Install security update from vendor's website.