CVE-2026-71433 LangGraph: Namespace prefix matching crosses segment boundaries in Postgres and SQLite stores
An authenticated attacker can retrieve data from other tenants or users due to flawed namespace prefix matching in LangGraph checkpoint stores.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-71433?
CVE-2026-71433 is a medium-severity missing authorization vulnerability in langchain-ai langgraph, published on 6 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-71433?
6 open source packages ship an affected version, including langgraph-checkpoint-postgres and langgraph-checkpoint-sqlite.
| Package | Affected | Fixed in |
|---|---|---|
langgraph-checkpoint-postgres PyPI | All versions | 3.1.1 |
langgraph-checkpoint-postgres PyPI | All versions | 3.1.1 |
langgraph-checkpoint-postgres PyPI | All versions | 3.1.1 |
langgraph-checkpoint-sqlite PyPI | All versions | 3.1.1 |
langgraph-checkpoint-sqlite PyPI | All versions | 3.1.1 |
langgraph-checkpoint-sqlite PyPI | All versions | 3.1.1 |
How do I fix CVE-2026-71433?
Upgrade langgraph-checkpoint-postgres to 3.1.1 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-71433 being exploited?
There is no known exploitation of CVE-2026-71433 in the wild and no public exploit code.
Sources
Also known as GHSA-47pj-3jcm-6whg, PYSEC-2026-3635, PYSEC-2026-3636.