CVE-2026-48129

Kestra task inputFiles accepts traversal filenames for worker file writes

MEDIUM

6.5

CVSS Score

Published: June 19, 2026 at 08:16 PM UTC

Updated: October 25, 2026 at 11:10 PM UTC

1 product affected across 1 vendorKestra

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.4%

SSVC

PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Kestra · Kestra Io

90%

v < 1.0.43>= 1.1.0, < 1.1.19 >= 1.2.0, < 1.2.19 >= 1.3.0, < 1.3.19

Affected range stops below 1.0.43, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.1.19, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.2.19, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.3.19, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRM

Source: cverecord

https://github.com/kestra-io/kestra/security/advisories/GHSA-q3fw-mvgv-pjr2

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: LOW

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-22

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