CVE-2026-34070

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.

Affected products

Langchain-Core

Langchain Langchain Core

< 1.2.22

Fix

Available

CVSS 3.1

7.5 HIGH

EPSS

1.4% (70th percentile)

Weakness

CWE-22

NVD status

Modified

Published

2026-03-31