CVE-2026-108789
Received Received - Intake

DeepSeek Harness Workflow Worker Thread Behavioral Manipulation

Publication date: 2026-10-12

Last updated on: 2026-10-12

Assigner: VulDB

Description
A vulnerability was identified in deepseek-ai deepseek-harness up to 0.1.1-rc.2. This affects the function agent of the component dsh-workflow-worker-thread. The manipulation leads to enforcement of behavioral workflow. The attack is possible to be carried out remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

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Meta Information

Published
2026-10-12
Last Modified
2026-10-12
Generated
2026-10-12
AI Q&A
2026-10-12
EPSS Evaluated
N/A
NVD
CVE-2026-108789
EUVD
EUVD-2026-97158

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
deepseek-ai deepseek-harness 0.1.1-rc.0
deepseek-ai deepseek-harness 0.1.1-rc.1
deepseek-ai deepseek-harness 0.1.1-rc.2

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-841 The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence.
CWE-840 Business Logic Errors

Attack-Flow Graph

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Executive Summary

This vulnerability allows model-generated scripts in DeepSeek Harness to escape a sandbox and gain full local code execution privileges. The issue occurs because host functions like 'agent' are injected into an empty VM context, enabling a one-line escape via 'agent.constructor' to access the 'process' object. This grants control over file system operations, network access, and command execution.

Detection Guidance

Check for installed versions of deepseek-harness up to 0.1.1-rc.2 using package managers like npm or pnpm. Inspect workflow scripts for suspicious Node.js VM context usage or global function injections such as agent, parallel, or pipeline. Look for unexpected file system operations or network access in logs.

Impact Analysis

An attacker with access to the workflow tool could execute arbitrary code on your system with the privileges of the DeepSeek Harness user. This includes reading, writing, or deleting files, accessing the network, and running system commands. The impact is severe but requires prior access to invoke the workflow tool.

Compliance Impact

The vulnerability allows arbitrary file system operations, unrestricted network access, and command execution with the user's privileges. This could lead to unauthorized data access, modification, or exfiltration, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information.

Mitigation Strategies

Upgrade to a patched version of deepseek-harness if available. Avoid injecting host-realm functions into VM contexts. Implement process-level sandboxing for the workflow worker. Disable or restrict access to the Web UI if not needed. Monitor for unusual file or network activity.

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