CVE-2026-54457

Received Received - Intake

Path Traversal in TensorZero Gateway

Publication date: 2026-08-21

Last updated on: 2026-08-21

Assigner: GitHub, Inc.

Description

TensorZero is an open-source LLMOps platform that unifies an LLM gateway, observability, evaluation, optimization, and experimentation. Prior to 2026.6.0, the TensorZero Gateway /internal/object_storage endpoint accepts a caller-supplied JSON storage_path parameter that dynamically overrides the [object_storage] configuration. Selecting the filesystem storage type allows arbitrary files on the gateway filesystem to be read, including credential files. Selecting the s3_compatible storage type causes outbound object-storage requests to attacker-chosen internal or cloud-metadata endpoints. Exploitation requires access to the gateway, which can be authenticated or unauthenticated depending on deployment configuration. This issue is fixed in version 2026.6.0.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-21

Last Modified

2026-08-21

Generated

2026-08-22

AI Q&A

2026-08-22

EPSS Evaluated

N/A

NVD

CVE-2026-54457

Affected Vendors & Products

Vendor	Product	Version / Range
tensorzero	tensorzero	to 2026.6.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-552	The product makes files or directories accessible to unauthorized actors, even though they should not be.
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

The vulnerability in TensorZero before version 2026.6.0 allows an attacker to manipulate the object_storage configuration via the /internal/object_storage endpoint. By supplying a malicious storage_path parameter, an attacker can force the system to read arbitrary files from the filesystem or send requests to attacker-chosen internal or cloud-metadata endpoints.

Detection Guidance

Check if your TensorZero Gateway version is below 2026.6.0. Inspect logs for unusual access to /internal/object_storage with a storage_path parameter. Monitor network traffic for unexpected outbound requests to cloud-metadata endpoints.

Impact Analysis

This vulnerability can lead to unauthorized file access, including sensitive credential files, if the filesystem storage type is selected. If the s3_compatible storage type is chosen, it may allow outbound requests to internal or cloud-metadata endpoints, potentially exposing internal services or metadata.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, including credential files, which may violate GDPR's data protection requirements and HIPAA's safeguards for protected health information. Unauthorized file reads or outbound requests to attacker-chosen endpoints could result in data breaches, non-compliance with data minimization principles, and failure to maintain confidentiality and integrity of sensitive data.

Mitigation Strategies

Upgrade TensorZero Gateway to version 2026.6.0 or later. If immediate upgrade is not possible, restrict access to the /internal/object_storage endpoint and disable unauthenticated access if enabled.

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