CVE-2026-48121
MediumCVSS 6.7Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
NoSQL injection vulnerability in @langchain/langgraph-checkpoint-mongodb up to version 1.3.0. Checkpoint identifiers (thread_id, checkpoint_ns, checkpoint_id) from config.configurable are passed into MongoDB find() queries without type enforcement, allowing an attacker to bypass thread scoping and leak checkpoints across tenants.
Risk Assessment
Risk of data leakage between tenants and unauthorized access to pending writes. Especially dangerous in applications that forward untrusted input into config.configurable without validation.
Recommendation
Upgrade the library to version 1.3.1 or later. Additionally, enforce string type for identifiers and validate input before passing to config.configurable.
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Original NVD description (English source)
@langchain/langgraph-checkpoint-mongodb provides a LangGraph.js CheckpointSaver implementation that uses MongoDB for storage. Versions 1.3.0 and below are vulnerable to NoSQL injection: checkpoint identifiers (thread_id, checkpoint_ns, checkpoint_id) from config.configurable are passed into MongoDB find() queries in MongoDBSaver.getTuple() without type enforcement. If an attacker supplies an object payload (such as MongoDB operators $gt or $ne) instead of a string, it can be interpreted as a query operator, bypassing thread scoping and leaking checkpoints, including pending writes, across tenants. Applications are at risk if they forward untrusted input into config.configurable without coercing it to strings or validating it against a schema, particularly in multi-tenant or user-isolated setups. Apps that only use server-issued, string-typed identifiers with schema validation rejecting non-string fields are not affected. This issue has been fixed in version 1.3.1.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

