Security Bulletin
Summary
Langflow OSS contains SSRF vulnerability in API Request component allowing authenticated flow authors to read localhost/private HTTP services via redirect following. APIRequestComponent.make_api_request() validates only initial URL with validate_and_resolve_url() and pins DNS for initial hostname, then passes attacker-controlled follow_redirects to make_request() which calls httpx.AsyncClient.request(..., follow_redirects=follow_redirects) without revalidating redirect destinations. Public URL redirecting to http://127.0.0.1:<port>/... bypasses direct SSRF block. Control: LANGFLOW_SSRF_PROTECTION_ENABLED=true blocks direct http://127.0.0.1 with SSRFProtectionError. Exploit: API Request with url_input='https://attacker-redirector/redirect?url=http://127.0.0.1:<port>/secret', follow_redirects=True follows redirect to localhost returning internal service response.
Vulnerability Details
CVEID: CVE-2026-10129
DESCRIPTION: Langflow OSS contains a Server-Side Request Forgery (SSRF) protection bypass vulnerability in the API Request component. An authenticated attacker with low-level privileges (flow author role) can bypass SSRF protections by enabling the follow_redirects parameter and supplying a public URL that redirects to internal/localhost addresses. The vulnerability exists because the application validates only the initial URL but does not re-validate redirect destinations. This allows attackers to access internal HTTP services, localhost endpoints, cloud metadata services, and private network resources that should be unreachable when SSRF protection is enabled. Successful exploitation can lead to disclosure of sensitive information including credentials, tokens, internal API responses, and administrative panel data.
CWE: CWE-918: Server-Side Request Forgery (SSRF)
CVSS Source: IBM
CVSS Base score: 8.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Langflow OSS | 1.0.0-1.9.3 |
Remediation/Fixes
IBM strongly recommends addressing the vulnerability now by upgrading Langflow OSS to version 1.10.0
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
23 Jun 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
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Document Location
Worldwide
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Document Information
Modified date:
23 June 2026
Initial Publish date:
23 June 2026
UID
ibm17277561