CVE-2026-105192
LMCache Unauthenticated RCE in multiprocess mode via pickle deserialization
Reported by jfrog · Published October 7, 2026
lmcache is fixed in 0.5.6 (PyPI)
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| lmcache | PyPI | 0.5.6 |
| kserve-huggingfaceserver-cuda-13.3 | Chainguard | 0.21.0-r6 |
| lmcache-cuda-13.0 | Chainguard | 0.5.6-r0 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| LMCache | LMCache | 0.3.9 |
| chainguard | kserve-huggingfaceserver-cuda-13.3 | 0 |
| chainguard | lmcache-cuda-13.0 | 0 |
| LMCache | LMCache | 0.3.9 |
Timeline
- Oct 7, 2026 EPSS Score (12 in total, the first dated here)
- Oct 7, 2026 Coalition ESS Score
- Oct 7, 2026 CVE Published
- Oct 29, 2026 CVE Updated
- Oct 30, 2026 Security Advisory
Query this with the API
The same record, from the CLI:
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References
- LMCache repository product
- lmcache on PyPI product
- DeviceIPCWrapper.Deserialize calls pickle.loads (v0.5.5) technical-description
- msgpack extension code 1 decoded with pickle (v0.3.9) technical-description
- JFrog Security Research advisory JFSA-2026-001694382 vendor-advisory
- LMCache update on CVE-2026-105192 vendor-advisory
- GHSA-w5f2-9q9c-ff4h vendor-advisory
- PR #5644: replace pickle in device IPC descriptors patch
- LMCache v0.5.6 patchrelease-notes
- PR #5684: bind example Kubernetes deployment to localhost mitigation
- PR #5685: run official images as a non-root user mitigation