CVE-2026-34070
Description
LangChain is a framework for building agents and LLM-powered applications. Prior to version 1.2.22, multiple functions in langchain_core.prompts.loading read files from paths embedded in deserialized config dicts without validating against directory traversal or absolute path injection. When an application passes user-influenced prompt configurations to load_prompt() or load_prompt_from_config(), an attacker can read arbitrary files on the host filesystem, constrained only by file-extension checks (.txt for templates, .json/.yaml for examples). This issue has been patched in version 1.2.22.
How to fix
- langchain langchain_core1.2.22 or later
- langchain-core1.2.22 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| langchain langchain_core | v < 1.2.22 | 1.2.22 |
| langchain-corePyPI | v < 1.2.22 | 1.2.22 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.