LMCache Unauthenticated RCE in multiprocess mode via pickle deserialization

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-105192
StatePUBLISHED
AssignerJFROG
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-07 10:17:32 UTC
Updated2026-10-07 18:17:15 UTC
DescriptionLMCache multiprocess mode, also called distributed mode, opens an unauthenticated ZeroMQ ROUTER so worker processes can register and share KV cache blocks. Messages on that socket are msgpack. Extension code 1 is passed to DeviceIPCWrapper.Deserialize, which calls pickle.loads, while the server is still decoding request arguments and before the handler runs. A single unauthenticated ZMQ DEALER message to the transport port (default 5555) therefore executes code as the user the LMCache process runs as. Official container images run that process as root. The transport binds to localhost unless the operator sets a routable address with --host, which is how multi-node deployments let peers connect.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.006710000 probability, percentile 0.504540000 (date 2026-10-07)

Problem Types: CWE-306 | CWE-502 | CWE-502 CWE-502: Deserialization of Untrusted Data | CWE-306 CWE-306: Missing Authentication for Critical Function

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA LMCache LMCache affected 0.3.9 * python Not specified

References

ReferenceSourceLinkTags
github.com/LMCache/LMCache/blob/v0.5.5/lmcache/v1/platform/base/ipc_wrap... [email protected] github.com
github.com/LMCache/LMCache [email protected] github.com
github.com/LMCache/LMCache/blob/v0.3.9/lmcache/v1/multiprocess/custom_ty... [email protected] github.com
pypi.org/project/lmcache [email protected] pypi.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Yuval Moravchick (en)

CNA: JFrog Security Research (en)

Additional Advisory Data

SourceTimeEvent
CNA2025-10-29T21:47:00.000ZLMCache v0.3.9 ships the multiprocess ZMQ transport and the pickle-backed msgpack extension

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