OmniGen2-RL contains an unauthenticated remote code execution vulnerability in the reward server component that allows remote attackers to execute arbitrary commands by sending malicious HTTP POST requests. Attackers can exploit insecure pickle deserialization of request bodies to achieve code execution on the host system running the exposed service.
Weakness
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Potential Mitigations
- Make fields transient to protect them from deserialization.
- An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.
Related Attack Patterns
References
- https://arxiv.org/abs/2506.18871
- https://chocapikk.com/posts/2026/omnigen2-pickle-rce/
- https://github.com/VectorSpaceLab/OmniGen2/blob/3a13017e532f9f309a38bca571fd62200a6415c5/OmniGen2-RL/reward_server/reward_proxy.py#L208
- https://github.com/VectorSpaceLab/OmniGen2/blob/3a13017e532f9f309a38bca571fd62200a6415c5/OmniGen2-RL/reward_server/reward_proxy.py#L224
- https://github.com/VectorSpaceLab/OmniGen2/blob/3a13017e532f9f309a38bca571fd62200a6415c5/OmniGen2-RL/reward_server/reward_server.py#L118
- https://github.com/VectorSpaceLab/OmniGen2/pull/139
- https://www.vulncheck.com/advisories/omnigen2-rl-reward-server-unsafe-deserialization-rce