CVE-2026-9081: Langflow OSS is affected by server-side request forgery in provider validation and API request functionality

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-05 · updated 2026-10-24
Weakness: CWE-918

Description

IBM Langflow OSS 1.0.0 through 1.10.3, and 1.0.0 through 1.10.3 contains a Server-Side Request Forgery (SSRF) vulnerability in the validate_model_provider_key() function for the Ollama provider. The function accepts a user-supplied OLLAMA_BASE_URL parameter and passes it directly to requests.get() without validation, scheme/host allowlisting, or filtering of private IP ranges (loopback, RFC1918, link-local addresses).

Affected products

IBM Langflow OSS: from 1.0.0 before 1.11.0 — fixed in 1.11.0

How to fix

Upgrade to a fixed version: IBM Langflow OSS 1.11.0. Check the vendor advisory for mitigations.

References

https://www.ibm.com/support/pages/node/7282650

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