CVE-2026-85684: External Control of File Name or Path in datalab-to marker
Description
marker through version 2.0.0 has a path traversal vulnerability in its FastAPI /marker/upload handler. The vulnerability arises because the file.filename parameter is not sanitized, allowing unauthenticated attackers to supply filenames with directory traversal sequences. This can lead to arbitrary file write or deletion on the affected system.
CVSS v4.0
Score 8.8high
Affected software
datalab-to
marker
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-85684 describes a path traversal vulnerability in datalab-to's marker product, specifically in the FastAPI /marker/upload endpoint. The handler does not sanitize the file.filename parameter, enabling unauthenticated attackers to craft filenames containing directory traversal sequences. This flaw allows attackers to write arbitrary files to any location or delete existing files on the system, potentially compromising system integrity and availability. The vulnerability affects all versions up to and including 2.0.0.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to write or delete arbitrary files on the affected system. This can lead to system compromise, data loss, or disruption of service. The CVSS 4.0 base score is 8.8 (high severity), reflecting the ease of exploitation (no privileges or user interaction required) and the significant impact on system integrity and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the /marker/upload endpoint and validate or sanitize file.filename inputs to prevent directory traversal sequences.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-04T13:51:42.217Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9adb47acd9273b49bef5c9
Added to database: 09/04/2026, 14:52:55 UTC
Last enriched: 09/15/2026, 00:55:55 UTC
Last updated: 10/19/2026, 18:48:24 UTC
Views: 95
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.