CVE-2026-48775
MediumCVSS 6.8Exploitation Probability (EPSS)
Low risk14th percentile - higher than 14% of all known CVEs
Summary
A vulnerability in LangGraph SQLite Checkpoint allows remote code execution through deserialization of untrusted JSON data. JsonPlusSerializer can reconstruct arbitrary Python objects from checkpoint payloads, enabling an attacker with write access to the checkpoint store to execute code during checkpoint loading.
Risk Assessment
The risk involves privilege escalation from checkpoint store write access to full code execution in the application runtime. Although this already requires a data integrity breach, the vulnerability significantly amplifies the potential impact of such an incident.
Recommendation
Immediately update the LangGraph library to version 4.1.1 or later. Additionally, secure the checkpoint store against unauthorized write access.
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Original NVD description (English source)
LangGraph SQLite Checkpoint is an implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via aiosqlite). In versions 4.1.0 and prior, the 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 turn result in code execution at checkpoint load time. This is a defense-in-depth issue. The affected behavior is reachable only when checkpoint bytes at rest in the backing store can be modified by an unauthorized party. In most deployments that prerequisite already implies a serious incident; the additional concern is turning "checkpoint-store write access" into code execution in the application runtime. This issue has been fixed in version 4.1.1.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS