Security Bulletin
Summary
Langflow uses Model Context Protocol (MCP) features to manage external server connections, project access, file resources, and local client integration. Weaknesses in MCP command and configuration validation, authentication and authorization enforcement, file resource handling, and request trust logic could allow unauthorized access to project or file data, unsafe configuration changes, unintended code retrieval, or arbitrary command execution in the Langflow server context.
Vulnerability Details
CVEID: CVE-2026-17625
DESCRIPTION: Langflow OSS could allow a remote authenticated attacker to execute arbitrary commands due to improper neutralization of special elements used in an OS command.
CWE: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSS Source: IBM
CVSS Base score: 7.2
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2026-17623
DESCRIPTION: Langflow OSS could allow a remote authenticated attacker to execute arbitrary commands due to improper validation of the command field in MCP server configurations.
CWE: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSS Source: IBM
CVSS Base score: 8.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2026-17630
DESCRIPTION: Langflow OSS could allow a remote attacker to execute arbitrary code due to improper validation of configuration parameters.
CWE: CWE-184: Incomplete List of Disallowed Inputs
CVSS Source: IBM
CVSS Base score: 7.2
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2026-17626
DESCRIPTION: Langflow could allow an authenticated attacker to read, modify, or expose sensitive host files via Docker-based MCP servers due to incomplete filtering of dangerous Docker volume-mount and device-mapping arguments.
CWE: CWE-266: Incorrect Privilege Assignment
CVSS Source: IBM
CVSS Base score: 8.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2026-8446
DESCRIPTION: Langflow OSS contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer endpoint when mcp_composer_enabled=true (default) and projects are configured with auth_type=oauth.
CWE: CWE-306: Missing Authentication for Critical Function
CVSS Source: IBM
CVSS Base score: 7.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
CVEID: CVE-2026-7646
DESCRIPTION: Langflow OSS allows users to read arbitrary files from the server
filesystem, including other users' uploaded documents, the JWT signing
secret, the SQLite database, and process environment variables, by sending
a crafted MCP `resources/read` request with a URL-encoded path traversal
sequence in the filename.
CWE: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS Source: IBM
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
CVEID: CVE-2026-9077
DESCRIPTION: Langflow allows remote authenticated attackers to bypass localhost-only restrictions and write arbitrary MCP server configurations to IDE configuration files on the host system.
CWE: CWE-807: Reliance on Untrusted Inputs in a Security Decision
CVSS Source: IBM
CVSS Base score: 8.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Langflow OSS | 1.0.0-1.10.3 |
| Langflow OSS | 1.0.0-1.10.3 |
| Langflow OSS | 1.0.0-1.10.3 |
| Langflow OSS | 1.0.0-1.10.3 |
| Langflow OSS | 1.0.0-1.10.3 |
| Langflow OSS | 1.0.0-1.10.3 |
| Langflow OSS | 1.0.0-1.10.3 |
Remediation/Fixes
IBM recommends upgrading to Langflow OSS 1.11.0 or newer https://github.com/langflow-ai/langflow/releases
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
CVEs reported to IBM: CVE-2026-8446 by odgrso (GMO CyberSecurity by Ierae, Inc.); CVE-2026-17626 by Thai Son Dinh (VinSOC Labs, (R&D).
Change History
31 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:
01 August 2026
Initial Publish date:
31 July 2026
UID
ibm17282147