LangGraph: Namespace prefix matching crosses segment boundaries in Postgres and SQLite stores

Summary

LangGraph Checkpoint Postgres and SQLite Checkpoint are the Postgres and SQLite implementations of LangGraph's checkpoint saver. Prior to 3.1.1, the langgraph-checkpoint-postgres and langgraph-checkpoint-sqlite packages persisted hierarchical namespaces as a dot joined string and scoped reads by matching that string as a simple prefix pattern, so a read scoped to one namespace could also match a sibling namespace whose flattened form shares the same leading characters, or a namespace label containing unescaped pattern metacharacters, allowing an authenticated caller to retrieve stored items belonging to another tenant or user through an ordinary scoped search or list namespaces call, with no crafted input required. This issue is fixed in versions 3.1.1 of langgraph-checkpoint-postgres and langgraph-checkpoint-sqlite.

Timeline

1. Aug 6, 2026, 7:03 PM UTCCVE published
2. Aug 7, 2026, 2:51 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Aug 7, 2026, 2:51 PM UTCRecord last updated

Affected versions

• langchain-ai langgraph

  fixed in 3.1.1

• langchain-ai langgraph-checkpoint-sqlite

  fixed in 3.1.1

• langchain-ai langgraph-checkpoint-postgres

  fixed in 3.1.1

• langgraph-checkpoint-sqlitePyPI

  fixed in 3.1.1

• langgraph-checkpoint-postgresPyPI

  fixed in 3.1.1

References 5