CVE-2026-55253 LangChain MongoDB - NoSQL Injection

LangChain MongoDB prior to langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0 contains a NoSQL injection caused by improper filtering of keys prefixed with $ in filter dictionaries, letting authenticated attackers bypass tenant isolation and access other tenants' data, exploit requires authenticated caller controlling filter arguments.

CVSS base score 7.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.53% chance of exploitation in 30 days
View the NVD record ↗