VULNERABILITY INTELLIGENCE

CVE-2026-34070

CVSS score7.5 HIGH
EPSS probability1.44%
CISA KEVNot currently listed
Published2026-03-31
Last modified2026-08-25
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-22
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-22

Primary references