Answer in brief
CVE-2026-55253 records a High severity (CVSS 7.7) vulnerability in LangChain MongoDB: NoSQL Operator Injection in MongoDBSaver.list() leading to cross-tenant data exposure. The current sources do not mark it as known exploited. The current feed maps langchain-ai/langchain-mongodb (generic), langchain-ai/langgraph-checkpoint-mongodb (generic), langchain-ai/langgraph-store-mongodb (generic), langgraph-checkpoint-mongodb (pip) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps langchain-ai/langchain-mongodb (generic), langchain-ai/langgraph-checkpoint-mongodb (generic), langchain-ai/langgraph-store-mongodb (generic), langgraph-checkpoint-mongodb (pip) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| langchain-ai/langchain-mongodbgeneric | < 0.4.0 | Not reported |
| langchain-ai/langgraph-checkpoint-mongodbgeneric | < 0.3.0 | Not reported |
| langchain-ai/langgraph-store-mongodbgeneric | < 0.4.0 | Not reported |
| langgraph-checkpoint-mongodbpip | <0.3.0 | 0.3.0 |
| langgraph-store-mongodbpip | <0.4.0 | 0.4.0 |
| langgraph-checkpoint-mongodbpypi | >=0 <0.3.0 | 0.3.0 |
| langgraph-store-mongodbpypi | >=0 <0.4.0 | 0.4.0 |
Published upstream
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 20, 2026
LangChain MongoDB provides integrations between MongoDB, Atlas, LangChain, and LangGraph. Prior to langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0, MongoDBSaver.list(), MongoDBSaver.alist(), and MongoDBStore.search() incorporate filter dictionaries into MongoDB queries without recursively rejecting keys prefixed with $. An authenticated caller who controls a filter argument through HTTP query parameters, request body fields, or agent tool arguments can inject MongoDB Query Language operators such as $regex or $where. In a multi-tenant deployment that uses the filter to enforce per-user or per-tenant isolation, injected operators can bypass intended equality filtering and expose other tenants' checkpoint or store data. Filters constructed entirely from trusted server-side values have lower practical risk. This issue is fixed in langgraph-checkpoint-mongodb 0.3.0 and langgraph-store-mongodb 0.4.0.
Quoted source text, attributed separately from HOL analysis.