CVE-2026-48129 Kestra task inputFiles accepts traversal filenames for worker file writes
Attackers can use path traversal in task inputFiles to write or overwrite files outside the working directory on Kestra workers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-48129?
CVE-2026-48129 is a medium-severity path traversal vulnerability in kestra-io kestra, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-48129?
How do I fix CVE-2026-48129?
No fix has been published for CVE-2026-48129 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-48129 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48129 exists.
Sources
Also known as GHSA-q3fw-mvgv-pjr2.