CVE-2026-76850Public exploitNetwork attack vector

Unauthenticated code execution via pickle deserialization

Published Aug 19, 2026 · Updated Aug 20, 2026

Deserialization of untrusted data in InternLM LMDeploy before 0.16.0 allows remote attackers to execute code via crafted peer messages. In disaggregated serving, handle_zmq_recv in lmdeploy/pytorch/disagg/conn/engine_conn.py calls recv_pyobj(), which runs pickle.loads() on bytes from a peer-selected ZMQ endpoint before any DistServeCacheFreeRequest validation occurs. The reachable path is an unauthenticated POST to /distserve/p2p_connect, which makes the engine connect its PULL socket to a caller-chosen address; deployments without disaggregated serving enabled are not affected.

CVSS severity9.3
Critical
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in InternLM LMDeploy before 0.16.0 allows remote attackers to execute code via crafted peer messages. In disaggregated serving, handle_zmq_recv in lmdeploy/pytorch/disagg/conn/engine_conn.py calls recv_pyobj(), which runs pickle.loads() on bytes from a peer-selected ZMQ endpoint before any DistServeCacheFreeRequest validation occurs. The reachable path is an unauthenticated POST to /distserve/p2p_connect, which makes the engine connect its PULL socket to a caller-chosen address; deployments without disaggregated serving enabled are not affected.

The record

CVE
CVE-2026-76850
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
InternLM
Product
LMDeploy
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.9.2 <0.16.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

InternLM · LMDeployversion=0.9.2 <0.16.0

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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