CVE-2025-59953 LMdeploy has Remote Code Execution by Pickle Deserialization via zmq_rpc.call_and_response() in InterLM/lmdeploy
Remote attackers can execute arbitrary code by sending malicious pickle data to the RPC server in LMdeploy.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-59953?
CVE-2025-59953 is a critical unsafe deserialization vulnerability in InternLM lmdeploy, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
LMDeploy is a toolkit for compressing, deploying, and serving large language models. Starting in version 0.9.1 and prior to version 0.10.2, the LMdeploy implements an rpc server (AsyncRPCServer in zmq_rpc.py) for supporting the RPC communications. In its core functionality call_and_response(), I found it will directly use the pickles.loads() to deserialize the received messages without any sanitization, hence resulting in a remote code execution vulnerability by this RPC server. Version 0.10.2 contains a patch.
Weakness: CWE-502
Which versions are affected by CVE-2025-59953?
3 open source packages ship an affected version, including lmdeploy.
| Package | Affected | Fixed in |
|---|---|---|
lmdeploy PyPI | From 0.9.1 | 0.10.2 |
lmdeploy PyPI | From 0.9.1 | 0.10.2 |
lmdeploy PyPI | From 0.9.1 | 0.10.2 |
How do I fix CVE-2025-59953?
Upgrade lmdeploy to 0.10.2 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-59953 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-59953 exists.
Sources
Also known as GHSA-5h8j-6crg-7rmw, PYSEC-2026-4079.