CVE WatchSep 10, 2026

CVE-2026-82533

DeepSeek Harness before 0.1.2-alpha.1 contains an authentication bypass vulnerability that grants unauthenticated access to its local HTTP a

CVSS

9.6

Critical

EPSS

0.4%

p35

KEV

—

Exploit Today

0-100

Published: Sep 8, 2026 · Last modified: Sep 10, 2026 · CWE-807

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

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