Vulnerability · Published Nov 4, 2026 · Assigned by VulnCheck

CVE-2026-82033DeepSeek Harness Unauthenticated RPC Command Execution

High 8.4

In plain English

A high-severity missing authentication in deepseek-harness from deepseek-ai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 3.1)8.4High

Exploit odds (30 days)0.2%top 87.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

DeepSeek Harness prior to 0.1.2-alpha.2, and specifically commit 3e24087, contains a missing authentication vulnerability in its web profile HTTP and WebSocket RPC control plane, allowing any local process, including those running as a different OS user, to reach unauthenticated session methods such as session.create and session.prompt. Attackers can invoke session.prompt to trigger the agent's bash and filesystem tools, achieve arbitrary command execution as the victim user using their configured model credentials, intercept live session traffic and logs over the event mux stream, and bypass human tool-approval checks via POST /api/respond by matching only rpcId, approvalId, and sessionId values broadcast over the ungated stream.

Affected products (as reported)

Vendor	Product	Versions
deepseek-ai	deepseek-harness	0 – before 0.1.2-alpha.20 – through 3e24087bfaeabe40b58ba2f7b936895b8f93fe27

Weakness: CWE-306 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Fixed Release Tag release-notes
Patch Commit patch
VulnCheck Advisory: DeepSeek Harness Unauthenticated RPC Command Execution third-party-advisory