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9.4
CVE-2026-82533: DeepSeek Harness lets unauthenticated API access
CVE-2026-82533 · published 1 month ago
Summary
Versions of DeepSeek Harness and its client connection packages before the latest release allow anyone to talk to the local control API without a password. This can let a malicious user run commands, read stored data, or break out of a sandboxed environment, especially if the service is exposed through a tunnel or proxy. Upgrade to the newest version and limit network exposure of the API to trusted hosts.
What to do
- Update deepseek-ai dsh-client-connection to version 0.1.2-alpha.1.
- Update deepseek-ai @deepseek-ai/dsh-client-connection to version 0.1.2-alpha.1.
- Update deepseek deepseek harness to version 0.1.2-alpha.1 or later.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| – | deepseek | deepseek harness | < 0.1.2-alpha.1 |
| npm | deepseek-ai | dsh-client-connection |
< 0.1.2-alpha.1 Fix: upgrade to 0.1.2-alpha.1
|
| npm | deepseek-ai | @deepseek-ai/dsh-client-connection |
< 0.1.2-alpha.1 Fix: upgrade to 0.1.2-alpha.1
|
Original advisory text
DeepSeek Harness < 0.1.2-alpha.1 Authentication Bypass via Host Header Spoofing
DeepSeek Harness before 0.1.2-alpha.1 contains an authentication bypass vulnerability that grants unauthenticated access to its local HTTP agent-control API by accepting a client-supplied loopback Host header in place of validating the actual TCP connection origin. On the default configuration, a confined tool-executed process can reach the loopback API without any port exposure and use it to escape its own OS sandbox, escalate to unconfined execution, and disable the approval prompt. When the port is externally reachable via tunnel, SSH forward, or reverse proxy, a remote attacker can exploit the same flaw to create sessions, execute arbitrary commands, and exfiltrate stored conversation transcripts without credentials.
References
- https://github.com/advisories/GHSA-8m2g-8cgm-3vcp
- https://github.com/deepseek-ai/deepseek-harness/commit/3e24087bfaeabe40b58ba2f7b...
- https://www.ox.security/blog/cve-2026-82533-deepseek-harness-ai-agent-sandbox-es... URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82533... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-82533 Vendor Advisory
- https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.1.2-alpha.1
- https://www.ox.security/blog/cve-2026-82533-deepseek-harness-ai-agent-sandbox-es...
- https://github.com/deepseek-ai/deepseek-harness Product
- https://www.vulncheck.com/advisories/deepseek-harness-alpha-1-authentication-byp...
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker full control
Severity
9.4
Critical
Type
CWE-807Reliance on Untrusted Inputs in a Security Decision
Timeline
Published8 Sep 2026
Updated10 Oct 2026
First seen8 Sep 2026
Sources
CVE-2026-82533 · NVD
CVE-2026-82533 · MITRE
CVE-2026-82533 · OSV
GHSA-8m2g-8cgm-3vcp · GHSA
GHSA-8m2g-8cgm-3vcp · OSV
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