Security Bulletin
Summary
Langflow contains multiple Server-Side Request Forgery vulnerabilities across several components where authenticated users can supply attacker-controlled URLs or database connection strings that reach internal network hosts without adequate validation. The LMStudio model and embeddings components pass a user-controlled base_url directly to httpx.AsyncClient without invoking the existing SSRF validation helper. The OpenAI-compatible model discovery function issues a server-side HTTP GET to a per-user-controlled base URL variable with no SSRF guard and with redirect-following enabled. The SSRF guard in validate_url_for_ssrf is bypassable on the RSSReaderSimple and SearXNGToolComponent components through a parser divergence on backslash-containing URLs, allowing the guard to pass on a public hostname while the HTTP client connects to a private address. The SQL Database connector SSRF guard inspects only the netloc hostname and not query parameters, allowing SQLAlchemy dialect host and port overrides to redirect the actual database connection to a blocked internal address. An authenticated attacker exploiting these vulnerabilities can probe and read from internal network services, cloud metadata endpoints, and internal databases reachable from the Langflow server process.
Vulnerability Details
CVEID: CVE-2026-19301
DESCRIPTION: Langflow OSS could allow a remote authenticated attacker to obtain sensitive information due to server-side request forgery.
CWE: CWE-918: Server-Side Request Forgery (SSRF)
CVSS Source: IBM
CVSS Base score: 5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N)
CVEID: CVE-2026-19305
DESCRIPTION: Langflow OSS could allow a remote attacker to obtain sensitive information due to server-side request forgery.
CWE: CWE-918: Server-Side Request Forgery (SSRF)
CVSS Source: IBM
CVSS Base score: 8.6
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N)
CVEID: CVE-2026-12766
DESCRIPTION: Langflow is vulnerable to server-side request forgery (SSRF). This may allow an authenticated attacker to send unauthorized requests from the system, potentially leading to network enumeration or facilitating other attacks
CWE: CWE-918: Server-Side Request Forgery (SSRF)
CVSS Source: IBM
CVSS Base score: 5.4
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)
CVEID: CVE-2026-19304
DESCRIPTION: Langflow OSS could allow a remote authenticated attacker to obtain sensitive information from internal services due to a URL parser discrepancy.
CWE: CWE-918: Server-Side Request Forgery (SSRF)
CVSS Source: IBM
CVSS Base score: 7.7
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Langflow OSS | 1.0.0-1.11.2 |
Remediation/Fixes
IBM strongly recommends addressing the vulnerability now by upgrading Langflow OSS to version 1.11.3
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
28 Aug 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:
28 August 2026
Initial Publish date:
28 August 2026
UID
ibm17285639