Vulnerability · Published Oct 26, 2026 · Assigned by VulDB

CVE-2026-116367DeepSeek Harness sandbox.ts createContext

Medium 6.3

In plain English

A medium-severity security flaw in Harness from DeepSeek. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.3%top 77.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was found in DeepSeek Harness up to 0.1.0-rc.5. This vulnerability affects the function createContext of the file packages/extensions/cordis-host-runner/src/sandbox.ts. The manipulation results in sandbox issue. It is possible to launch the attack remotely. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products (as reported)

Vendor	Product	Versions
DeepSeek	Harness	0.1.0-rc.00.1.0-rc.10.1.0-rc.20.1.0-rc.30.1.0-rc.40.1.0-rc.5

Weakness: CWE-265, CWE-264 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:X/RL:X/RC:C

References

VDB-426331 | DeepSeek Harness sandbox.ts createContext vdb-entry, technical-description
VDB-426331 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-116367 | CVE Analysis and Report third-party-advisory
Submit #1012736 | DeepSeek deepseek-harness（@deepseek-ai/dsh，DeepSeek Harness） 0.2.0-rc.2 Remote Code Execution third-party-advisory