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CVE-2026-53995— MLflow 3.17.1 Path Traversal via Trace ID API

Quick assessment

Affected
mlflow mlflow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MLflow 3.17.1 及更早版本中的 FileStore 跟踪后端存在路径遍历漏洞。未经身份验证的攻击者可以通过向 端点提交包含路径遍历序列的伪造跟踪 ID（trace ID），从而控制文件系统路径。攻击者可利用 方法，在服务器进程文件系统权限允许的范围内，将 、 和标签文件（tag files）写入到预期的实验跟踪目录之外，且写入内容包含攻击者控制的元数据。 FileStore 是 MLflow 3.7.0 之前的默认跟踪后端；从 3.7.0 起，默认后端已更改为 SQLite 数据库，FileStore

CVSS 8.2 · High
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I. Basic Information for CVE-2026-53995

Vulnerability Information
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Vulnerability Title
MLflow 3.17.1 Path Traversal via Trace ID API
Source: CVE Program / CVE List V5
Vulnerability Description
MLflow 3.17.1 and earlier contains a path traversal vulnerability in the FileStore tracking backend that allows unauthenticated attackers to control filesystem paths by submitting a crafted trace ID containing traversal sequences to the POST /api/3.0/mlflow/traces endpoint. Attackers can exploit FileStore.start_trace() to write trace_info.yaml, request_metadata, and tag files with attacker-controlled metadata outside the intended experiment trace directory, subject to the server process's filesystem permissions. FileStore is the default tracking backend before MLflow 3.7.0 and opt-in thereafter (the default changed to a SQLite database), so deployments in the earlier part of the affected range are vulnerable without special configuration while later ones are affected only when FileStore is explicitly selected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mlflow mlflow 0 ~ 3.17.1 -

II. Public POCs for CVE-2026-53995

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III. Intelligence Information for CVE-2026-53995

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Patches & Fixes for CVE-2026-53995 (1)

Vendor Advisories for CVE-2026-53995 (1)

Proof of Concept for CVE-2026-53995 (1)

IV. Related Vulnerabilities

Same product: mlflow
Same vendor: mlflow
Same weakness: CWE-22

V. Comments for CVE-2026-53995

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