CVE-2026-47661
Received Received - Intake

Path Traversal in Pathling Server

Publication date: 2026-08-07

Last updated on: 2026-08-07

Assigner: GitHub, Inc.

Description
Pathling is a set of tools that make it easier to use FHIR and clinical terminology within health data analytics. Prior to version 2.0.0 of Pathling Server, Pathling's `/$result` endpoint allows a caller who can obtain any valid async export job ID to supply `file` parameter values containing path traversal sequences. The handler verifies only the supplied `job` and never normalises or confines the requested `file` path to that job's `jobs/<jobId>` directory before opening it as a filesystem resource. Because async export scratch space lives under the same warehouse database root as persisted resource tables, an attacker can use their own export job to read other files from the warehouse. This is fixed in Pathling Server 2.0.0. As an interim mitigation, disable the async export operations (`pathling.operations.exportEnabled`, `patientExportEnabled`, `groupExportEnabled`, `bulkSubmitEnabled`) or enable authentication and restrict export capability to trusted callers.

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Meta Information

Published
2026-08-07
Last Modified
2026-08-07
Generated
2026-08-08
AI Q&A
2026-08-07
EPSS Evaluated
N/A
NVD
CVE-2026-47661
EUVD
EUVD-2026-54642

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
aehrc pathling_server to 2.0.0 (exc)
aehrc pathling_server 2.0.0
pathling pathling_server 2.0.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

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Executive Summary

This is a path traversal vulnerability in Pathling's /$result endpoint affecting versions before 2.0.0. The flaw allows attackers to read arbitrary files in the warehouse directory by supplying path traversal sequences like ../../ in the file parameter. The endpoint does not validate or normalize file paths, enabling access to sensitive files such as patient data tables, Delta logs, or warehouse marker files.

Detection Guidance

Check for unauthorized access to files in the warehouse directory by monitoring for path traversal attempts in logs. Look for suspicious export job IDs or file parameters containing sequences like ../ or ..\ in requests to the /$result endpoint. Review file access logs for unexpected reads outside the job directory.

Impact Analysis

An attacker can exploit this to read sensitive files from the warehouse, including patient data stored in Parquet tables, Delta logs, or other configuration files. This could lead to unauthorized access to protected health information. The impact is higher if export operations are enabled and authentication is disabled, allowing remote attackers to access data without credentials.

Compliance Impact

This vulnerability likely violates compliance requirements under GDPR and HIPAA due to unauthorized access to protected health information. GDPR mandates strict protection of personal data, while HIPAA requires safeguards for protected health information. Exploitation could result in data breaches, leading to legal penalties, reputational damage, and loss of trust.

Mitigation Strategies

Upgrade to Pathling Server version 2.0.0 or later. As a temporary measure, disable async export operations by setting pathling.operations.exportEnabled, patientExportEnabled, groupExportEnabled, and bulkSubmitEnabled to false. If authentication is available, restrict export capabilities to trusted users only.

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