Path Traversal in Kestra Workflow Automation

Publication date: 2026-06-19

Last updated on: 2026-06-23

Assigner: GitHub, Inc.

Description

Kestra is an open-source, event-driven orchestration platform. Prior to versions 1.3.19, 1.2.19, 1.1.19, and 1.0.43, Kestra task `inputFiles` writes rendered file names directly under the task working directory. When a flow forwards untrusted execution or webhook data into an `inputFiles` file name, a caller can use `../` path segments to create or overwrite files outside that task working directory on the worker filesystem. Versions 1.3.19, 1.2.19, 1.1.19, and 1.0.43 patch the issue.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-06-19

Last Modified

2026-06-23

Generated

2026-07-11

AI Q&A

2026-06-20

EPSS Evaluated

2026-07-10

NVD

CVE-2026-48129

Affected Vendors & Products

Vendor	Product	Version / Range
kestra	kestra	to 1.3.19\|end_excluding=1.2.19\|end_excluding=1.1.19\|end_excluding=1.0.43 (exc)

Helpful Resources

Exploitability

CWE

KEV

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

Executive Summary

This vulnerability exists in Kestra, an open-source event-driven orchestration platform. Prior to certain fixed versions, the Kestra task called `inputFiles` writes rendered file names directly under the task's working directory. If a flow forwards untrusted execution or webhook data into an `inputFiles` file name, an attacker can use `../` path segments to traverse directories and create or overwrite files outside the intended task working directory on the worker filesystem.

Impact Analysis

This vulnerability can allow an attacker to overwrite or create files outside the designated working directory of a task. This can lead to unauthorized modification of files on the worker filesystem, potentially impacting the integrity of the system. The CVSS score indicates a moderate severity with high impact on integrity and low impact on availability.

Mitigation Strategies

To mitigate this vulnerability, upgrade Kestra to versions 1.3.19, 1.2.19, 1.1.19, or 1.0.43 or later, as these versions contain patches that prevent the directory traversal issue in the inputFiles task.

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