Arbitrary worker file write via traversal filenames
Published Jun 19, 2026 · Updated Jun 19, 2026
Path traversal in Kestra before 1.3.19, 1.2.19, 1.1.19, and 1.0.43 allows remote attackers to write worker files. FilesService.inputFiles renders each attacker-controlled map key as a child path and writes it without the containment or filename checks used by other helpers. Exploitation requires a flow to forward untrusted execution or webhook data into an inputFiles filename; the worker can create or overwrite only files writable by its process user.
Summary
What happened
Path traversal in Kestra before 1.3.19, 1.2.19, 1.1.19, and 1.0.43 allows remote attackers to write worker files. FilesService.inputFiles renders each attacker-controlled map key as a child path and writes it without the containment or filename checks used by other helpers. Exploitation requires a flow to forward untrusted execution or webhook data into an inputFiles filename; the worker can create or overwrite only files writable by its process user.
The record
- CVE
- CVE-2026-48129
- Published
- Jun 19, 2026
- Updated
- Jun 19, 2026
- Vendor
- Kestra
- Product
- Kestra
- Classifications
- CWE-22, T1565.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 19, 2026CVE publishedPublication date reported by the CVE source.
- Jun 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.0.43
- Affected versionversion=>= 1.1.0, < 1.1.19
- Affected versionversion=>= 1.2.0, < 1.2.19
- Affected versionversion=>= 1.3.0, < 1.3.19
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-q3fw-mvgv-pjr2 webhook traversal proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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