Arbitrary file write and deletion via upload path
Published Sep 4, 2026 · Updated Sep 4, 2026
Path traversal in Datalab Marker 2.0.0 and earlier allows remote attackers to write or delete arbitrary host files through an upload. The FastAPI /marker/upload handler joins the upload directory with the unsanitized multipart file.filename value, writes attacker-controlled bytes, and then removes the same traversed path. The route requires no authentication; filesystem permissions bound which existing files can be overwritten or deleted, and cleanup normally removes a newly written file.
Summary
What happened
Path traversal in Datalab Marker 2.0.0 and earlier allows remote attackers to write or delete arbitrary host files through an upload. The FastAPI /marker/upload handler joins the upload directory with the unsanitized multipart file.filename value, writes attacker-controlled bytes, and then removes the same traversed path. The route requires no authentication; filesystem permissions bound which existing files can be overwritten or deleted, and cleanup normally removes a newly written file.
The record
- CVE
- CVE-2026-85684
- Published
- Sep 4, 2026
- Updated
- Sep 4, 2026
- Vendor
- Datalab
- Product
- Marker
- Classifications
- CWE-73, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- Sep 4, 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?
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- Affected versionversion=0 <=2.0.0
What conditions does exploitation require?
What is affected?
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
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Technologies
Your stack
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Your stack
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