What’s Vulnerable › Vulnerabilities

CVE-2026-48129: Kestra task inputFiles accepts traversal filenames for worker file writes

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-19 · updated 2026-10-25
• Weakness: CWE-22

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 products

• kestra-io kestra: before 1.0.43; from 1.1.0, < 1.1.19; from 1.2.0, < 1.2.19; from 1.3.0, < 1.3.19

References

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

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