PYSEC-2026-2573 LangGraph Checkpoint: Unsafe JSON deserialization in checkpoint loading

Summary LangGraph's JsonPlusSerializer can reconstruct Python objects from JSON checkpoint payloads. Under conditions where someone could modify checkpoint bytes at rest in the backing store, the deserialization path could reconstruct objects beyond what the application expects, which could in tu...

EUVD-2026-37140

LangGraph Checkpoint: Unsafe JSON deserialization in checkpoint loading...

PT-2026-23498

Name of the Vulnerable Software and Affected Versions LangGraph versions 1.0.9 and earlier Description LangGraph checkpointers can load msgpack-encoded checkpoints that reconstruct Python objects during deserialization. If an attacker gains privileged write access to the checkpoint data store e.g...