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CVE-2026-76850— LMDeploy Remote Code Execution via Unsafe Pickle Deserialization in the Disaggregated Serving Peer Connector

Quick assessment

Affected
InternLM lmdeploy
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

InternLM lmdeploy是中国InternLM组织开源的一个用于压缩、部署和服务 LLM 的工具包。 InternLM lmdeploy 0.9.2版本至0.16.0之前版本存在反序列化注入漏洞，该漏洞源于使用pickle反序列化disaggregated-serving对等消息，且相关端点未进行身份验证，可能导致远程攻击者执行任意代码。

CVSS 9.8 · Critical EPSS 1.27% · P70

Affected Version Matrix 1

VendorProduct Version RangeStatus
InternLM lmdeploy 0.9.2< 0.16.0 affected
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I. Basic Information for CVE-2026-76850

Vulnerability Information
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Vulnerability Title
LMDeploy Remote Code Execution via Unsafe Pickle Deserialization in the Disaggregated Serving Peer Connector
Source: CVE Program / CVE List V5
Vulnerability Description
LMDeploy deserializes disaggregated-serving peer messages with pickle. The handle_zmq_recv coroutine in lmdeploy/pytorch/disagg/conn/engine_conn.py reads peer-to-peer cache-free requests with recv_pyobj(), which deserializes the received bytes with pickle.loads(), and the isinstance check against DistServeCacheFreeRequest runs only after deserialization has already completed. The peer that supplies those bytes is caller-controlled: p2p_connect passes remote_engine_endpoint_info.zmq_address from the request body to connect() on the ZMQ PULL socket, and the POST /distserve/p2p_initialize and /distserve/p2p_connect endpoints in lmdeploy/serve/openai/api_server.py apply no authentication unless the server is started with api_keys, which defaults to None. A remote attacker can direct an engine to pull from a ZMQ endpoint under their control and execute arbitrary code in the engine process. Deployments that do not enable disaggregated serving are not affected, because the receive loop is only started once the migration backend accepts the connection.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
InternLM lmdeploy 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
InternLM lmdeploy是中国InternLM组织开源的一个用于压缩、部署和服务 LLM 的工具包。 InternLM lmdeploy 0.9.2版本至0.16.0之前版本存在反序列化注入漏洞，该漏洞源于使用pickle反序列化disaggregated-serving对等消息，且相关端点未进行身份验证，可能导致远程攻击者执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
InternLM lmdeploy 0.9.2 ~ 0.16.0 -

II. Public POCs for CVE-2026-76850

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8263 chars
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III. Intelligence Information for CVE-2026-76850

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Patches & Fixes for CVE-2026-76850 (3)

Vendor Advisories for CVE-2026-76850 (1)

Proof of Concept for CVE-2026-76850 (1)

Vendor Pages for CVE-2026-76850 (1)

Other References for CVE-2026-76850 (1)

IV. Related Vulnerabilities

Same product: lmdeploy
Same vendor: InternLM
Same weakness: CWE-502