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Marker EUVDEUVD-2026-71133

| CVE-2026-85684 HIGH
External Control of File Name or Path (CWE-73)
2026-09-04 VulnCheck GHSA-g3jg-rghx-7246
8.8
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.8 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.1 CRITICAL

Unauthenticated network endpoint writes or deletes arbitrary files; no confidentiality impact; integrity and availability both high.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Sep 04, 2026 - 15:49 vuln.today
CVE Published
Sep 04, 2026 - 14:32 cve.org
HIGH 8.8

DescriptionCVE.org

marker through 2.0.0 contains a path traversal vulnerability in the FastAPI /marker/upload handler that fails to sanitize the file.filename parameter. Unauthenticated attackers can supply filenames containing directory traversal sequences to write arbitrary files to any location or delete existing files on the system.

AnalysisAI

Arbitrary file write and deletion in datalab-to/marker through v2.0.0 exposes servers to full filesystem compromise via the FastAPI /marker/upload handler. Unauthenticated remote attackers can supply directory traversal sequences in the file.filename parameter - unsanitized before use in path construction - to write attacker-controlled content to or delete files at any location reachable by the server process. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation The marker FastAPI server must be running with the `/marker/upload` endpoint network-accessible to the attacker - confirmed unauthenticated by the PR:N CVSS vector. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VI:H/VA:H) accurately reflects a worst-case posture: fully remote, zero-authentication, low-complexity exploitation against any network-reachable instance. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patch version has been confirmed in the available data; the issue is tracked in GitHub issue #1047 at https://github.com/datalab-to/marker/issues/1047, and operators should monitor the upstream repository at https://github.com/datalab-to/marker for a patched release. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Audit all Marker deployments at v2.0.0 or earlier, verify internet exposure, and immediately isolate or disable the /marker/upload endpoint for any public-facing instances. …

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EUVD-2026-71133 vulnerability details – vuln.today

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