{"data":{"id":"fcd569d2-a28d-40f4-a195-871e49351684","title":"GHSA-533j-2v4q-mw5h: LangChain MongoDB has NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure","summary":"A NoSQL injection vulnerability (a type of attack where an attacker can manipulate database queries by injecting special operators) exists in two MongoDB libraries for LangChain: langgraph-checkpoint-mongodb and langgraph-store-mongodb. The vulnerable methods (MongoDBSaver.list(), MongoDBSaver.alist(), and MongoDBStore.search()) don't properly block MongoDB query operators (special commands prefixed with $) from user input, allowing an authenticated attacker to read data belonging to other users or tenants in a multi-tenant system.","solution":"Upgrade to langgraph-checkpoint-mongodb version 0.3.0 or later, and langgraph-store-mongodb version 0.4.0 or later. If you cannot upgrade immediately, remove or escape MongoDB Query metacharacters such as \"$\" in your application code before passing any user-controlled input to the filter parameter.","labels":["security"],"sourceUrl":"https://github.com/advisories/GHSA-533j-2v4q-mw5h","publishedAt":"2026-08-20T17:29:14.000Z","cveId":"CVE-2026-55253","cweIds":null,"cvssScore":null,"cvssSeverity":"high","severity":"high","attackType":["rag_poisoning"],"issueType":"vulnerability","affectedPackages":["langgraph-store-mongodb@< 0.4.0 (fixed: 0.4.0)","langgraph-checkpoint-mongodb@< 0.3.0 (fixed: 0.3.0)"],"affectedVendors":["LangChain"],"affectedVendorsRaw":["LangChain","langgraph-checkpoint-mongodb","langgraph-store-mongodb"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":"unknown","epssScore":0,"patchAvailable":true,"disclosureDate":"2026-08-20T17:29:14.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["confidentiality"],"aiComponentTargeted":"rag","llmSpecific":false,"classifierConfidence":0.95,"researchCategory":null,"atlasIds":["AML.T0020","AML.T0051.001"]}}