CVE-2026-108789 Details
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.
A vulnerability exists in the Deepseek-ai Deepseek-harness workflow tool, specifically in versions up to 0.1.1-rc.2. The issue arises in the '@deepseek-ai/dsh-workflow-worker-thread' package, where the tool executes model-generated workflow scripts in a Node.js virtual machine (VM) context created from an empty object. However, it injects host-realm functions as global variables, allowing for a one-line escape into the worker thread. This exploitation bypasses the file sandbox and enables unauthorized access to the filesystem and network.
The vulnerability can be addressed by stopping the injection of host-realm functions into the VM context, running the workflow tool under a process-level isolation that restricts filesystem and network access, and hardening the worker as an additional defense measure.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 12, 2026CISA-ADP
Assessed Oct 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/deepseek-ai/deepseek-harness/ | [email protected] | Vendor |
| https://github.com/deepseek-ai/deepseek-harness/discussions/243 | [email protected] | ExploitTechnical AnalysisVendor |
| https://mcniyfj5bw9b.feishu.cn/docx/M5H6d9AbioNftYxwk9CchJgGnHc | [email protected] | ExploitPartial Content |
| https://vuldb.com/cve/CVE-2026-108789 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/959699 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/416568 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/416568/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-840 | Business Logic Errors | [email protected] |
| CWE-841 | Improper Enforcement of Behavioral Workflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| deepseek-ai deepseek-harness | <= 0.1.1-rc.2 (semver) |
CPE
Remediation
| |
| deepseek-ai dsh-workflow-worker-thread | 0.1.0-rc.6 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 13, 2026 | CVE Modified | CISA-ADP |
| Oct 12, 2026 | New CVE Received | [email protected] |