CVE-2026-48129

Kestra task inputFiles accepts traversal filenames for worker file writes

At a glance

Severity: MEDIUM 6.5
EPSS: EPSS 0.36 % · percentile 30 (2026-10-27)
State: PUBLISHED
Published: 2026-06-19
Updated: 2026-06-23
Assigner: GitHub_M
NVD status: Deferred

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L	GitHub_M
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L	NVD · security-advisories@github.com (Secondary)

Weaknesses (CWE)

CWE-22

European references

ENISA EUVD · EUVD-2026-38081
GCVE · GCVE-0-2026-48129

Affected products

Product	Versions
kestra-io · kestra	affected < 1.0.43 ; affected >= 1.1.0, < 1.1.19 ; affected >= 1.2.0, < 1.2.19 ; affected >= 1.3.0, < 1.3.19

References

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

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD