Vulnerability · Published Jun 19, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity path traversal in kestra from kestra-io. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 69.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

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

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L

References

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