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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-105192)

ID	Name	Product	Family	Type	Severity
476170	Chainguard: lmcache-cuda-13.0: security update to 0.5.6-r0	Tenable Cloud Security	Chainguard Local Security Checks	Local	critical
476170	Chainguard: lmcache-cuda-13.0: security update to 0.5.6-r0	Tenable Self-Hosted Container Security	Chainguard Local Security Checks	Local	critical
476084	SCA: security update for lmcache (GHSA-w5f2-9q9c-ff4h)	Tenable Cloud Security	SCA Checks	Local	critical
476084	SCA: security update for lmcache (GHSA-w5f2-9q9c-ff4h)	Tenable Self-Hosted Container Security	SCA Checks	Local	critical

Detections

Analytics

CVE-2026-105192

critical

Tenable Plugins

critical

critical

critical

critical