# CVE-2026-101102: DeepSeek deepseek-harness sandbox isolation issue in Code Mode

Source: https://junglewise.ai/threats/cve-2026-101102-a-vulnerability-was-found-in-deepseek-ai-deepseek-harness-up-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-28. Updated: 2026-09-28  
License: CC BY 4.0 with a link back

CVE-2026-101102 · Severity: medium · CVSS 6.3 · Published 2026-09-28

DeepSeek deepseek-harness is a code execution component that runs user-submitted code. A vulnerability in the Code Mode Sandbox allows attackers to escape or circumvent the containment boundaries, potentially gaining unauthorized access to the underlying system. The vendor has explicitly stated the worker is not designed as a security boundary, limiting practical protective measures.

Technologies: [Deepseek-Harness](https://junglewise.ai/threats/technologies/deepseek-harness-1). Vendors: [DeepSeek](https://junglewise.ai/threats/vendors/deepseek).

## Quick answers

**Is CVE-2026-101102 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101102 being exploited in the wild.

**How severe is CVE-2026-101102?** Medium severity, with a CVSS score of 6.3, published 28 September 2026.

**Which products and versions are affected?** Deepseek-Harness up to 0.1.0-rc.7.

**Is there a fix for CVE-2026-101102?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-101102 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-101102?** Check whether you run Deepseek-Harness at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The run_code function in the Code Mode Sandbox component contains a sandbox isolation issue allowing remote attackers to bypass containment. The vulnerability requires network access and results in sandbox escape or isolation bypass. The vendor documented the worker as a containment mechanism rather than a security boundary, and did not respond to early disclosure attempts.

## Affected products

- DeepSeek deepseek-harness up to 0.1.0-rc.7

## Timeline

- 2026-09-28: disclosed

## References

- [https://vuldb.com/cve/CVE-2026-101102](https://vuldb.com/cve/CVE-2026-101102)
- [https://vuldb.com/submit/935737](https://vuldb.com/submit/935737)