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Critical · 9.8 Public exploit CVE-2026-105192 EUVD-2026-94261GHSA-vv44-hjm2-qw2fGHSA-w5f2-9q9c-ff4h

LMCache Unauthenticated RCE in multiprocess mode via pickle deserialization

Published Oct 7, 2026 · Updated Oct 29, 2026 · Assigned by JFROG

Vendor: LMCache Product: LMCache Package: lmcache Ecosystem: PyPI

Description

LMCache 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. The decode path shipped in v0.3.9 and is present through v0.5.5, including the v0.5.6 release candidates. v0.5.6, published on 2026-10-14, removes pickle.loads from this path.

Affected products

VendorProductAffectedFixed
LMCache LMCache 0.3.9 – < 0.5.6 0.5.6

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 2 repositories

  • basesixtythree/B63-POC-CVE-2026-105192 ★ 0 · Nov 1, 2026

    CVE-2026-105192 (LMCache): pre-auth pickle deserialization RCE over the unauth ZMQ transport (single frame) — b63 showcase, lab-verified with patched-build negative + reliability/matrix evidence

  • rxsklife/CVE-2026-105192 ★ 0 · Oct 8, 2026

    CVE-2026-105192 is a critical (CVSS 9.8) vulnerability in LMCache, an open-source distributed key-value cache for LLM inference engines like vLLM.

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI lmcache >= 0.3.9, < 0.5.6 0.5.6 GHSA-w5f2-9q9c-ff4h

References