CVE-2026-115886 MLflow: SSRF on unauthenticated MLflow servers via third-party scorer kwargs in the scorer invoke, register, and GenAI evaluate endpoints
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115886?
CVE-2026-115886 is a medium-severity vulnerability in mlflow, published on 23 Oct 2026.
Official description
MLflow is an open source AI engineering platform for agents, large language models, and machine learning models. From 3.12.0rc0 until 3.17.0, the scorer invoke, register, and GenAI evaluate endpoints, including unauthenticated POST /ajax-api/3.0/mlflow/scorer/invoke, accept serialized third-party scorer data that Scorer.model_validate_json resolves using a module-path allowlist without constraining the selected class or its constructor arguments. When optional trulens and trulens-providers-litellm packages are installed, an attacker can select mlflow.genai.scorers.trulens, choose a model URI outside MLflow's native provider registry so execution uses the LiteLLM fallback, and supply api_base and api_key values that cause the server to send an outbound request to an attacker-chosen or internal host with attacker-controlled headers and body. The vulnerable deserialization occurs before a tracking-store lookup or job submission. This issue is fixed in version 3.17.0.
Which versions are affected by CVE-2026-115886?
3 open source packages ship an affected version, including mlflow.
| Package | Affected | Fixed in |
|---|---|---|
mlflow Bitnami | From 3.12.0 | 3.17.0 |
mlflow PyPI | From 3.12.0rc0 | 3.17.0 |
mlflow PyPI | From 3.12.0rc0 | 3.17.0 |
How do I fix CVE-2026-115886?
Upgrade mlflow to 3.17.0 or later.
Is CVE-2026-115886 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-115886 exists.
Public exploit code: 1 Nuclei template.
Sources
Also known as BIT-mlflow-2026-115886, GHSA-2wqp-q3c6-ccj5.